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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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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An air capacitor of capacity $C=10\mu F$ 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 $\mu C$

2. 699 $\mu C$

3. 480 $\mu C$

4. 24 $\mu C$

Subtopic:  Dielectrics in Capacitors |
From NCERT
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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 ${120}^{0}$ with the x-axis

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

3. 200 V/m, making an angle $-{60}^{0}$ with the x-axis

4. 100 V/m, making an angle ${30}^{0}$ 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) $\frac{\sqrt{2}{Q}^{2}}{4\pi {\epsilon }_{0}a}$

(3) $\frac{\sqrt{2}{Q}^{2}}{\pi {\epsilon }_{0}a}$

(4) $\frac{{Q}^{2}}{2\pi {\epsilon }_{0}a}$

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) $V\sqrt{e/m}$

(2) $\sqrt{eV/m}$

(3) $\sqrt{2eV/m}$

(4) $2eV/m$

Subtopic:  Electric Potential Energy |
83%
From NCERT
PMT - 2000
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The dimension of (1/2) : 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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