JEE Questions for Physics Electrostatics I Quiz 26 - MCQExams.com

Assertion Electrons move away from a low potential to high potential region.
Reason Because electrons have negative charge.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes 6 times.
Reason Capacity of the capacitor does not depend upon the nature of the materials
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy which is stored becomes K times.
Reason The surface density of charge on the plate remains constant or unchanged.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Electric lines of force cross each other.
Reason Electric field at a point superimposes to give one resultant electric field.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion If a proton and an electron are placed in the same uniform electric field. They experience different acceleration.
Reason Electric force on a test charge is independent of its mass.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Dielectric breakdown occurs under the influence of an intense light beam.
Reason Electromagnetic radiations exert pressure.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Annihilation of electron and positron is an example of decay of charges.
ReasonIn the process of annihilation an electron and a positron combine to give gamma ray.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Surface of a symmetrical conductor can be treated as equipotential surface.
ReasonCharges can easily flow in a conductor
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The lightening conductor at the top of high building has sharp pointed ends.
Reason The surface density of charge at sharp points is very high resulting in setting up of electric wind.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion A charged capacitor is disconnected from a battery. Now if its plate are separated farther, the potential energy will fall
Reason Energy stored in a capacitor is equal to the work done in charging it
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The force with which one plate of a parallel plate capacitor is attracted towards the other plate is equal to square of surface density per co per unit area.
Reason The electric field due to one charged plate of the capacitor at the location of the other is equal to surface density per ɛ0.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Mass of ion is slightly differed from its element.
Reason Ion is formed, when some electrons are removed or added so mass changes.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor does not change.
Reason The displacement current arises in the region in which the electric field and hence the electric flux does not change with time.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion If a point q is placed in front of an infinite grounded conducting plane surface, the point charge will experience a force.
Reason This force is due to the induced charge on the conducting surface which is at zero potential.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The surface charge densities of two spherical conductors of different radii are equal. Then the electric field intensities near their surface are also equal.
Reason Surface charge density is equal to charge per unit area.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases.
Reason Electric field is inversely proportional to square of distance from the charge or an electric dipole.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The tyres of aircraft\'s are slightly conducting.
Reason If a conductor is connected to ground, the extra charge induced on conductor will flow to ground.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Conductors having equal positive charge and volume, must also have same potential.
Reason Potential depends only on charge and volume of conductor.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion At a point in space, the electric field points towards north. In the region, surrounding this point the rate of change of potential will be zero along the east and west.
ReasonElectric field due to a charge is the space around the charge.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion A point charge is brought in an electric field. The field at a nearby point will increase, whatever be the nature of the charge.
Reason The electric field is independent of the nature of charge
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
In the following four situations charged particles are at equal distance the origin. Arrange them the magnitude of the net electric field at origin greatest first
Physics-Electrostatics I-72931.png
  • (i) > (ii) > (iii) > (iv)
  • (ii) > (i) > (iii) > (iv)
  • (i) > (iii) > (ii) > (iv)
  • (iv) > (iii) > (ii) > (i)
A linear charge linear charge density λ1, penetrates acube diagonally and then it penetrate a sphere diametrically as shown. What will be the ratio of flux coming cut of cube and sphere
Physics-Electrostatics I-72932.png

  • Physics-Electrostatics I-72933.png
  • 2)
    Physics-Electrostatics I-72934.png

  • Physics-Electrostatics I-72935.png

  • Physics-Electrostatics I-72936.png

Physics-Electrostatics I-72937.png
  • E3 = E0
  • E30
  • E3> E0
  • E3≥ E0
An electron falls through a small distance in a uniform electric field of magnitude 2 × 104NC–1. The direction of the field is reversed keeping the magnitude unchanged and a proton falls through the same distance. The time of fall will be
  • Same in both cases
  • More in the case of an electron
  • More in the case of proton
  • Independent of charge
A point charge is surrounded symmetrically by six identical charges at distance r as shown in the figure. How much work is done by the forces of electrostatic repulsion when the point charge q at the centre is removed at infinity
Physics-Electrostatics I-72938.png
  • Zero
  • 6q2 / 4πɛ0r
  • q2 / 4πɛ0r
  • 12q2 / 4πɛ0r

Physics-Electrostatics I-72939.png
  • 6 q
  • –6 q
  • 5 q
  • –5 q
Figure shows a charged conductor resting on an insulating stand. If at the point P the charge density a, the potential is V and the electric field strength is E, what are the values of these quantities at point Q Charge density Potential Electric intensity
Physics-Electrostatics I-72941.png
  • >σ >V >E
  • >σ V >E
  • <σ V E
  • <σ V
Two point charge – q and +q /2 are situated at the origin and at the point (a, 0,respectively. The point along the X-axis where the electric field vanishes is

  • Physics-Electrostatics I-72942.png
  • 2)
    Physics-Electrostatics I-72943.png

  • Physics-Electrostatics I-72944.png

  • Physics-Electrostatics I-72945.png
The electric field in a region surrounding the origin is uniform and along the x–axis. A small circle is drawn with centre at the origin cutting the axis at points A, B, C, D having co-ordinates (a,(0, a) (– a, 0), (0, – a); respectively as shown in figure then potential in minimum at the point
Physics-Electrostatics I-72946.png
  • A
  • B
  • C
  • D
In moving from A to B along an electric field line, the electric field does 6.4 × 10–19 J of work on an electron, If ɸ1, ɸ2, are equipotential surfaces, then the potential differences (VC–VA) is
Physics-Electrostatics I-72947.png
  • –4 V
  • 4 V
  • Zero
  • 64 V
In the following figure two parallel metallic plates are maintained at different potential. If an electron is released midway between the plates, it will move
Physics-Electrostatics I-72948.png
  • Right ward at constant speed
  • Left ward at constant speed
  • Accelerated right ward
  • Accelerated left ward

Physics-Electrostatics I-72949.png

  • Physics-Electrostatics I-72950.png
  • 2)
    Physics-Electrostatics I-72951.png
  • Zero

  • Physics-Electrostatics I-72952.png
In the following diagram, the charge and potential difference across 8 µF capacitor will be respectively
Physics-Electrostatics I-72953.png
  • 320 µ C, 40 V
  • 420µC, 50 V
  • 214µ C, 27 V
  • 360µC, 45 V
A conducting sphere of radius R, and carrying a chargeq is joined to a conducting sphere of radius 2R, and carrying a charge – 2q. The charge flowing between them will be

  • Physics-Electrostatics I-72954.png
  • 2)
    Physics-Electrostatics I-72955.png

  • Physics-Electrostatics I-72956.png

  • Physics-Electrostatics I-72957.png
An arc of radius r carries charge. The linear density of charge is λ and the arc subtends a angle π /3at the centre. What is the electric potential at the centre

  • Physics-Electrostatics I-72958.png
  • 2)
    Physics-Electrostatics I-72959.png

  • Physics-Electrostatics I-72960.png

  • Physics-Electrostatics I-72961.png
A neutral water molecule (H0in it\'s vapor state hasan electric dipole moment of magnitude 6.4 × 10–30 C-m. How far apart are the molecules centres positive and negative charge
  • 4 m
  • 4 mm
  • 4 µm
  • 4 pm
A charge Q is fixed at a distance d in front of an infinite metal plate. The lines of force are represented by
Physics-Electrostatics I-72962.png

  • Physics-Electrostatics I-72963.png
  • 2)
    Physics-Electrostatics I-72964.png

  • Physics-Electrostatics I-72965.png

  • Physics-Electrostatics I-72966.png
In a parallel plate capacitor the separation between the plates is 3 mm with air between them. Now a 1 mm thick layer of a material of dielectric constant 2 is introduced between the plates due to which the capacity increases. In order to bring to the original value the separation between the plates must be made
  • 4.5 mm
  • 1.5 mm
  • 2.5 mm
  • 3.5 mm
Find equivalent capacitance between A and B
Physics-Electrostatics I-72967.png
  • 6C
  • 5C
  • 3C
  • 2C
The radii of the inner and outer spheres of a condenser are 9 cm and 10 cm respectively. If the dielectric constant of the medium between the two spheres is 6 and charge on the inner sphere is 18 × 10–9 coulomb, then the potential of inner sphere will be, if the outer sphere is earthed
  • 180 volts
  • 30 volts
  • 18 volts
  • 90 volts
In the following figure, the charge on each condenser in the steady state will be
Physics-Electrostatics I-72968.png
  • 3 µC
  • 6 µC
  • 9 µC
  • 12 µC

Physics-Electrostatics I-72969.png

  • Physics-Electrostatics I-72970.png
  • 2)
    Physics-Electrostatics I-72971.png
  • 1

  • Physics-Electrostatics I-72972.png
A metallic spherical shell of radius R has a charge – Q on it. A point charge + Q is placed at the centre of the shell. Which of the graphs shown below may correctlyrepresent the variation of the electric field E with distance r from the centre of the shell

  • Physics-Electrostatics I-72973.png
  • 2)
    Physics-Electrostatics I-72974.png

  • Physics-Electrostatics I-72975.png

  • Physics-Electrostatics I-72976.png
Two parallel infinite line charges + λ and –λ are placedwith a separation distance R in free space. The net electric field exactly mid-way between the two line charges is
  • Zero
  • 2)
    Physics-Electrostatics I-72977.png

  • Physics-Electrostatics I-72978.png

  • Physics-Electrostatics I-72979.png
Two small spheres of masses M1 and M2 are suspended by weightless insulating threads of lengths L1 and L2. The spheres carry charges Q1 and Q2 respectively. The spheres are suspended such that they are in level with one another and the threads are inclined to the vertical at angles of θ1 and θ2 as shown. Which one of the following conditions is essential, if θ1 = θ2 ?
Physics-Electrostatics I-72980.png
  • M1 ≠ M2 , but Q1 = Q2
  • M1 = M2
  • Q1 = Q2
  • L1 = L2
Two identical positive charges are fixed on the y -axis at equal distances from the origin O. A negatively charged particle starts on the x-axis, at a large distance from O, moves along the x-axis, passes through O and moves far away from O. Its acceleration a is taken as positive along its direction of motion. The best graph between the particle's acceleration and its x-coordinate is represented by

  • Physics-Electrostatics I-72982.png
  • 2)
    Physics-Electrostatics I-72983.png

  • Physics-Electrostatics I-72984.png

  • Physics-Electrostatics I-72985.png

Physics-Electrostatics I-72987.png
  • 6
  • 7
  • 8
  • 9
A simple pendulum has a length l and the mass of the bob is m. The bob is given a charge q coulomb. The pendulum is suspended between the vertical plates of a charged parallel plate capacitor. If E is the electric field strength between the plates, the time period of the pendulum is given by

  • Physics-Electrostatics I-72989.png
  • 2)
    Physics-Electrostatics I-72990.png

  • Physics-Electrostatics I-72991.png

  • Physics-Electrostatics I-72992.png

Physics-Electrostatics I-72994.png

  • Physics-Electrostatics I-72995.png
  • The potential energy of the system is zero

  • Physics-Electrostatics I-72996.png

  • Physics-Electrostatics I-72997.png
A cubical region of side a has its centre at the origin. It encloses three fixed point charges, - q at (0, a / 4, 0), + 3q and – q at (0, + a/ 4, 0). Choose the correct option(s).
Physics-Electrostatics I-72998.png
  • The net electric flux crossing the plane x =+ a/2 is equal to the net electric flux crossing the plane x= -a/2
  • The net electric flux crossing the plane y =+ a/2 is more than the net electric flux crossing the plane y= -a/2
  • The net electric flux is not crossing the entire region is q / ε0
  • The net electric flux crossing the plane z =+ a/2 is equal to the net electric flux crossing the plane x = + a/2
0:0:1


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