JEE Questions for Physics Electrostatics Ii Quiz 4 - MCQExams.com

An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is σ, electric intensity in the space between the plates is E. A uniform magnetic field B also exists in the space perpendicular to the direction of E. The electron moves perpendicular to both E and B without any change in direction. The time taken by the electron to travel a distance l in the space is
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A parallel plate capacitor having air as dielectric medium is charged by a potential difference of V volt. After disconnecting the battery, the distance between the plates of the capacitor is increased using an insulated handle. As a result, potential difference between the plates
  • increases
  • does not change
  • becomes zero
  • decreases
The capacitance of a parallel plate capacitor with air as medium is 3 µF. With the introduction of a dielectric medium between the plates, the capacitance becomes 15 µF. The permittivity of the medium is
  • 5 C2 N -1 m -2
  • 15 C2 N -1 m -2
  • 0.44 × 10 -10 C2 N -1 m -2
  • 8.854 × 10 -11 C2 N -1 m -2
A parallel plate condenser with a dielectric of dielectric constant K between the plates has a capacity C and is charged to a potential V volt. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is

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The plates of a parallel plate capacitor with air as medium are separated by a distance of 8 mm. A medium of dielectric constant 2 and thickness 4 mm having the same area is introduced between the plates. For the capacitance to remain the same, the distance between the plates is
  • 8 mm
  • 6 mm
  • 4 mm
  • 12 mm
  • 10 mm
A parallel plate capacitor has a dielectric slab of dielectric constant K between its plates that covers 1/3 of the area of its plates, as shown in the figure. The total capacitance of the capacitor is C while that of the portion with dielectric in between is C1. When the capacitor is charged, the plate area covered by the dielectric gets charge Q1 and the rest of the area gets charge Q2 . The electric field in the dielectric is E1 and that in the other portion is E2. Choose the correct option/options, ignoring edge effects.
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In the circuit shown in the figure, there are two parallel plate capacitors each of capacitance C. The switch S1 is pressed first to fully charge the capacitor C1 and then released. The switch S2 is then pressed to charge the capacitor C2 . After sometime, S2 is released and then S3 is pressed. After sometime,
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  • the charge on the upper plate of C1 is 2 CV0
  • the charge on the upper plate of C1 is CV0
  • the charge on the upper plate of C2 is 0
  • the charge on the upper plate of C2 is –CV0
In the given network, the value of C, so that an equivalent capacitance between A and B is 3 µF, is
Physics-Electrostatics II-73199.png
  • 36 µF
  • 48 µF
  • 31/5 µF
  • 1/5 µF
A gang capacitor is formed by interlocking a number of plates as shown in figure. The distance between the consecutive plates is 0.885 cm and the overlapping area of the plates is 5 cm2. The capacity of the unit is
Physics-Electrostatics II-73201.png
  • 1.06 pF
  • 4 pF
  • 6.36 pF
  • 12.72 pF
A network of six identical capacitors, each of value C, is made as shown in the figure. The equivalent capacitance between the points A and B is
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    Physics-Electrostatics II-73205.png

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  • Physics-Electrostatics II-73207.png

  • Physics-Electrostatics II-73208.png
Effective capacitance between points A and B in the figure, shown is
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    Physics-Electrostatics II-73212.png

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The equivalent capacitance between the points A and B in the following circuit is
Physics-Electrostatics II-73216.png
  • 1 μF
  • 2 μF
  • 4 μF
  • 8 μF

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The protonic charge in 100 gm of water is .......... c

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  • Physics-Electrostatics II-73226.png

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  • Physics-Electrostatics II-73231.png
The rate of alpha particle falls on neutral sphere is 1012 per second. The time in which sphere gets charged by 2c is ......... sec.
  • 2.25
  • 3.15
  • 6.25
  • 1.66
A charge Q is divided into two parts and then they are placed at a fixed distance. The force between the two charges is always maximum when the charges are .........

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Two point charges repel each other with a force of 100 N. One of the charges is increased by 10% and other is reduced by 10%. The new force of repulsion at the same distance would be ........ N.
  • 121
  • 100
  • 99
  • 89
Given that q1 + q2 = q if the between q1 and q2 is maximum, q1/q……..
  • 1
  • 0.75
  • 0.25
  • 0.5
Two small conducting sphere of equal radius have charges +1c and – 2c respectively and placed at a distance d from each other experience force F1. If they are brought in contact and separated to the same distance, they experience force F2. The ratio of F1 to F2 is ………
  • –8 : 1
  • 1 : 2
  • 1 : 8
  • –2 : 1
Three charges, each of value Q, are placed at the vertex of an equilateral triangle. A fourth charge q is placed at the centre of the triangle. If the charges remains stationery then, q = ...............

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Two equal negative charges –q are fixed at points (o, a) and (o, –a). A positive charge Q is released from rest at the point (2a, o) on the X - axis. The charge Q will ..........
  • Move to the origin and remain at rest there
  • Execute simple harmonic motion about the origin
  • Move to infinity
  • Execute oscillations but not simple harmonic motion
Four charges, each equal to –Q, are placed at the corners of a square and a charge +q is placed at its centre. If the system is in equilibrium, the value of q is .........

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For the system shown in figure, if the resultant force on q is zero, then Q = ...............
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Two point positive charges q each are placed at (–a, o) and (a, o). A third positive charge qo is placed at (o, y). For which value of y the force at qo is maximum .........
  • a
  • 2a

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Two identical charged spheres suspended from a common point by two massless strings of Length l are initially a distance d (d << l ) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the spheres approach each other with a velocity ν. Then function of distance x between them becomes ...........

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Three identical spheres each having a charge q and radius R, are kept in such a way that each touches the other two spheres. The magnitude of the electric force on any sphere due to other two is ...........

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Two equal negative charges –q are fixed at points (o, a) and (o, –a) on the Y axis. A positive charge q is released from rest at the point x (x < < a) on the X-axis, then the frequency of motion is .........

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