An air capacitor of capacity C=10μF is connected to a constant voltage battery of 12 V. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is

1. 120 μC

2. 699 μC

3. 480 μC

4. 24 μC

Subtopic:  Dielectrics in Capacitors |
From NCERT
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A and B are two concentric metallic shells. If A is positively charged and B is earthed, then electric

                                             

1.  Field at common centre is non-zero

2.  Field outside B is nonzero

3.  Potential outside B is positive

4.  Potential at common centre is positive

Subtopic:  Electric Potential |
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The electric potential at a point at distance 3R from the centre of disc
of radius R lying in the axis of the disc whose surface charge density is σ
will be given by:
1. σ2ε02-3R                          2. σ2ε02+3R
3.σ2ε03-2R                           4. σ2ε03+2R

Subtopic:  Electric Potential |
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An elementary particle of mass m and charge e is projected with velocity v at a much more massive particle of charge Ze, where . What is the closest possible approach of the incident particle ?

(1) 

(2) 

(3) 

(4) 

Subtopic:  Electric Potential Energy |
 57%
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The figure shows some of the equipotential surfaces. Magnitude and direction of the electric field is given by

              

1.  200 V/m, making an angle 1200 with the x-axis

2. 100 V/m, pointing towards the negative x-axis

3. 200 V/m, making an angle -600 with the x-axis

4. 100 V/m, making an angle 300 with the x-axis

Subtopic:  Relation between Field & Potential |
 57%
From NCERT
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In the circuit shown in figure, energy stored in \(6~\mu\text{F}\) capacitor will be:
      

1. \(48 \times10^{-6}~\text{J}\) 2. \(32 \times10^{-6}~\text{J}\)
3. \(96 \times10^{-6}~\text{J}\) 4. \(24 \times10^{-6}~\text{J}\)
Subtopic:  Energy stored in Capacitor |
 64%
From NCERT
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Four equal charges Q are placed at the four corners of a square of each side is ‘a’. Work done in removing a charge – Q from its centre to infinity is 

(1) 0

(2) 2Q24πε0a

(3) 2Q2πε0a

(4) Q22πε0a

Subtopic:  Electric Potential Energy |
 52%
From NCERT
AIIMS - 1995
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Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of the electric field at the surface of the spheres is 

(1) a/b

(2) b/a

(3) a2/b2

(4) b2/a2

Subtopic:  Electric Potential |
 55%
From NCERT
PMT - 1999
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An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. The final speed of the electron will be 

(1) Ve/m

(2) eV/m

(3) 2eV/m

(4) 2eV/m

Subtopic:  Electric Potential Energy |
 83%
From NCERT
PMT - 2000
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The dimension of (1/2) ε0E2  (ε0: permittivity of free space; E: electric field) is

(1) MLT–1

(2) ML2L–2

(3) ML–1T–2

(4) ML2T–1

Subtopic:  Energy stored in Capacitor |
 74%
From NCERT
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