JEE Questions for Physics Electrostatics I Quiz 20 - MCQExams.com

The acceleration of an electron in an electric field of magnitude 50 V/cm, if e/m value of electron is 1.76 × 1011 C/kg, is
  • 8.8 × 1014 m/sec2
  • 6.2 × 1013 m/sec2
  • 5.4 × 1012 m/sec2
  • Zero

Physics-Electrostatics I-72189.png

  • Physics-Electrostatics I-72190.png
  • 2)
    Physics-Electrostatics I-72191.png

  • Physics-Electrostatics I-72192.png
  • 7
The work done in bringing a 20 coulomb charge from point A to point B for distance 0.2 m is 2 J. The potential difference between the two points will be (in volt)
  • 0.2
  • 0
  • 0.1
  • 0.4
A hollow sphere of charge does not produce an electricfield at any
  • Point beyond 2 m
  • Point beyond 10 m
  • Interior point
  • Outer point
Kinetic energy of an electron accelerated in a potential difference of 100 V is
  • 1.6 × 10–17 J
  • 1.6 × 1021 J
  • 1.6 × 10–29 J
  • 1.6 × 10–34 J
If identical charges (–q) are placed at each corner of a cube of side b, then electric potential energy of charge(+q) which is placed at centre of the cube will be

  • Physics-Electrostatics I-72196.png
  • 2)
    Physics-Electrostatics I-72197.png

  • Physics-Electrostatics I-72198.png

  • Physics-Electrostatics I-72199.png
An electron having charge \'e\' and mass \'m\' is moving in a uniform electric field E. Its acceleration will be

  • Physics-Electrostatics I-72201.png
  • 2)
    Physics-Electrostatics I-72202.png

  • Physics-Electrostatics I-72203.png

  • Physics-Electrostatics I-72204.png
Cathode rays travelling from East to West enter into region of electric field directed towards North to South in the plane of paper. The deflection of cathode rays is towards
  • East
  • South
  • West
  • North

Physics-Electrostatics I-72206.png
  • Negative, increase
  • Positive, decrease
  • Negative, decrease
  • Positive increase
A simple pendulum of period T has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will
  • Greater than T
  • Remains equal to T
  • Less than T
  • Infinite
A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV,its kinetic energy will be
  • 1840 keV
  • 1/1840 keV
  • 1 keV
  • 920 keV
An electron moving with the speed 5 × 106 m per sec is shooted parallel to the electric field of intensity 1× 103 N/C. Field is responsible for the retardation of motion of electron. Now evaluate the distance travelled by the electron before coming to rest for an instant (mass of e= 9 × 10–31 kg. charge = 1.6 × 10–19 C)
  • 7m
  • 0.7 mm
  • 7 cm
  • 0.7 cm
An electron enters in high potential region V2from lower potential region V1 then its velocity
  • Will increase
  • Will change in direction but not in magnitude
  • No change in direction of field
  • No change in direction perpendicular to field
The electric potential at the surface of an atomic nucleus (Z =of radius 9.0 × 10–13 cm is
  • 80 volts
  • 8 × 106 volts
  • 9 volts
  • 9 × 105 volts
The figure shows the path of a positively charged particle 1 through a rectangular region of uniform electric field as shown in the figure. What is the direction of electric field and the direction of particles 2, 3 and 4
Physics-Electrostatics I-72211.png
  • Top; down, top, down
  • Top; down, down, top
  • Down; top, top, down
  • Down; top, down, down
A particle has a mass 400 times than that of the electron and charge is double than that of a electron. Itis accelerated by 5V of potential difference. Initially the particle was at rest, then its final kinetic energy will be
  • 5 eV
  • 10 eV
  • 100 eV
  • 2000 eV
Two point charges –q and +q are located at points (0,0 – a) and (0, 0, a), respectively. The potential at a point (0, 0, z) where z > a is

  • Physics-Electrostatics I-72214.png
  • 2)
    Physics-Electrostatics I-72215.png

  • Physics-Electrostatics I-72216.png

  • Physics-Electrostatics I-72217.png
An uniform electric field E exists along positive x-axis. The work done in moving a charge 0.5 C through a distance 2 m along a direction making an angle 60° with x- axis is 10 J. Then the magnitude of electric field is
  • 5 Vm–1
  • 2 Vm–1

  • Physics-Electrostatics I-72219.png
  • 40 Vm–1
  • 20 Vm–1
Four point +ve charges of same magnitude (Q) are placed at four corners of a rigid square frame as shown in figure. The plane of the frame is perpendicular to Z–axis. If a –ve point charge is placed charge is placed at a distance z away from the above frame (z << L) then
Physics-Electrostatics I-72221.png
  • –ve charge oscillates along the Z-axis.
  • It moves away from the frame
  • It moves slowly towards the frame and stays in the plane of the frame
  • It passes through the frame only once.
A charge of 10 e.su isi placed at a distance of 2 cm from a charge of 40 e.s.0 and 4 cm from another charge of 20 e.s.u. The potential energy of the charge 10 e.s.u. is (in ergs)
  • 87.5
  • 112.5
  • 150
  • 250
When a positive q charge is taken from lower potential to a higher potential point, then its potential energy will
  • Decrease
  • Increase
  • Remain unchanged
  • Become zero
When a negative charge is taken at a height from earth\'s surface, then its potential energy
  • Decreases
  • Increases
  • Remains unchanged
  • Will become infinity
When a charge of 3 coulomb is placed in a uniform electric field, it experiences a force of 3000 Newton within this field, potential difference between two points separated by a distance of 1 cm is
  • 10 volts
  • 90 volts
  • 1000 volts
  • 3000 volts
There are two equipotential surfaces as shown in figure. The distance between them is r. The charge of –q coulomb is taken from the surface A to B, the resultant work done will be
Physics-Electrostatics I-72225.png

  • Physics-Electrostatics I-72226.png
  • 2)
    Physics-Electrostatics I-72227.png

  • Physics-Electrostatics I-72228.png
  • Zero
A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10V. The potential at a distance of 2 cm from the centre of the sphere
  • Zero
  • 10 V
  • 4 V
  • 10/3 V
The work done in carrying a charge of 5 µC from a point A to a point B in an electric field is 110 mJ. The potential difference (VB–VA) is then
  • +2kV
  • –2kV
  • +200 V
  • –200 V
There is 10 units of charge at the centre of a circle of radius 10m. The work done in moving 1 unit of charge around the circle once is
  • Zero
  • 10 units
  • 100 units
  • 1 unit
Two parallel plates separated by a distance of 5 mm are kept at a potential difference of 50V A particle of mass 10–15kg and charge 10–11C entres in it with a velocity 107 m/s The acceleration the particle will be
  • 108 m/s2
  • 5 × 105 m/s2
  • 105m/s2
  • 2 × 103 m/s2
The wrong statement about electric lines of force is
  • These originate from positive charge and end on negative charge
  • They do not intersect each other at a point
  • They have the same from for a point charge and a sphere
  • They have physical existence
Two infinitely long parallel conducting plates having surface charged density +σ and –σrespectively, are separated by a small distance. The medium between the plates is vacuum. If ɛ0 is the dielectric permittivity of vacuum, then the electric field in the region between the plates is
  • 0 volts/metre
  • 2)
    Physics-Electrostatics I-72233.png

  • Physics-Electrostatics I-72234.png

  • Physics-Electrostatics I-72235.png
A charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6 × 10–16 C, 3 kg, the charge on it and excess number of electrons on the particle are respectively (g = 10 m/s2)
  • 4.8 × 10–19 C,3
  • 5.8 × 10–19 C,4
  • 3.8 × 10–19 C, 2
  • 2.8 × 10–19 C, 41
Four charges +Q, – Q, + Q, – Q are placed at the corners of a square taken in order. At the centre of the square
  • E = 0, V = 0
  • E = 0, V ≠ 0
  • E ≠ 0, V = 0
  • E ≠ 0, V ≠ 0
Charge q, 2q, 3q and 4q are placed at the corners A, B, C and D of a square as shown in the following figure. The direction of electric field at the centre of the square is along
Physics-Electrostatics I-72239.png
  • AB
  • CB
  • BD
  • AC
Point charges q1 = 2 µC and q2 = –1 µC are kept at points x = 0 and x = 6 respectively. Electrical potential will be zero at points
  • x = 2 and x = 9
  • x = 1 and x = 5
  • x= 4 and x = 12
  • x = –2 and x = 2
Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are
  • Planes parallel to toyz–plane
  • Planes parallel to xy–plane
  • Planes parallel to xz–plane
  • Coaxial cylinders of increasing radii around the x-axis
A bullet fo mass 2 gm is having a charge of 2µC. Through what potential difference must it be accelerated, starting from rest, to acquire a speed of 10 m/s
  • 5 kV
  • 50 kV
  • 5 V
  • 50 V
The points resembling equal potentials are
Physics-Electrostatics I-72244.png
  • P and Q
  • S and Q
  • S and R
  • P and R
Figure shows three points A, B and C in a region of uniform electric field E ⃗. The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where VA,VBand VC represent the electric potential at points A, B and C respectively
Physics-Electrostatics I-72245.png
  • VA = VB = VC
  • VA = VB> VC
  • VA = VB< VC
  • VA> VB = VC
In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential and points outside S have negative potential. A positive charge, which is free tomove, is placed inside S
  • It will remain in equilibrium
  • It can move inside S, but it cannot cross S
  • It must cross S at some time
  • It may move, but will ultimately return to its starting point
As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge – Q from the point A [co-ordinates (0, a)] to another point B [co-ordinates (a, 0)] along the straight path AB is
Physics-Electrostatics I-72246.png
  • Zero
  • 2)
    Physics-Electrostatics I-72247.png

  • Physics-Electrostatics I-72248.png

  • Physics-Electrostatics I-72249.png

Physics-Electrostatics I-72251.png
  • 8q2
  • 8q 1
  • 6q 2
  • 6q 1

Physics-Electrostatics I-72253.png
  • Only E1 is electrostatic
  • Only E2 is electrostatic
  • Both are electrostatic
  • None of these
The potential on the hollow sphere of radius 1 m is 100 volt. The potential at 1/4 m from the centre of sphere is
  • 1000 volt
  • 500 volt
  • 250 volt
  • 0 volt
The spatial distribution of the electric field due to charge (A, B) is shown in figure. Which one of the following statement is correct
Physics-Electrostatics I-72255.png
  • A is +ve and B – ve and |A| > |B|
  • A is – ve and B + ve; |A| = |B|
  • Both are +ve but A > B
  • Both are – ve but A > B
. What is not true for equipotential surface for uniform electric field?
  • Equipotential surface is flat
  • Equipotential surface is spherical
  • Electric lines are perpendicular to equipotential surface
  • Work done is zero
Charges +q and –q are placed at points A and B respectively which are a distance 2L apart, C is the midpoint between A and B. The work done in moving a charge +Q along the semicircle CRD is
Physics-Electrostatics I-72257.png

  • Physics-Electrostatics I-72258.png
  • 2)
    Physics-Electrostatics I-72259.png

  • Physics-Electrostatics I-72260.png

  • Physics-Electrostatics I-72261.png
The potential at a point x (measured in µm) due to some charges situated on the x–axis is given by V(x) = 20 / (x2 –volts. The electric field E atx = 4 µm is given by
  • 5/3 Volt / µm and in the –ve x direction
  • 5/3 Volt / µm and in the +ve x direction
  • 10/ 9 Volt / µm and in the –vet x direction
  • 10/ 9 Volt / µm and in the + vet x direction
Identify the false statement.
  • Inside a charged or neutral conductor electrostatic field is zero
  • The electrostatic field at the surface of the charged conductor must be tangential to the surface at any point
  • There is no net charge at any point inside the conductor
  • Electrostatic potential is constant throughout the volume of the conductor
  • Electric field at the surface of a charged conductor is proportional to the surface density
Four electric charges +q, + q, – q and –q are placed at the corners of a square of side 2L (see figure). The electric potential at point A, midway between the two charges +q
Physics-Electrostatics I-72264.png
  • Zero
  • 2)
    Physics-Electrostatics I-72265.png

  • Physics-Electrostatics I-72266.png

  • Physics-Electrostatics I-72267.png
The electric potential V at any point (x, y, z), all in meters in space is given by V = 4x2. VoltThe electric field at the point (1, 0,in volt/meter is
  • 16 along positive X-axis
  • 8 along negative X-axis
  • 8 along negative X-axis
  • 16 along negative X-axis
0:0:1


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