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NEET Physics : Electrostatic Potential and Capacitance

Multiple Choice Questions

41.

The capacity of an air condenser is 2.0 µF. If a medium is placed between its plates, the capacity becomes 12 μF. The
dielectric constant of the medium will be

42.

A capacitor having capacitance 1 uF with air, is filled with two dielectrics as shown. How many times capacitance will increase

43.

Figure shows three spherical and equipotential surfaces A, B and C round a point charge q. The potential difference $V_{A} - V_{B} = V_{B} - V_{C}$ If t₁ and t₂ be the distances between them, then

t₁ = t₂
t₁ > t₂
t₁ < t₂
t₁ ≤ t₂

44.

When a charged particle moving with velocity $\vec{v}$ is subjected to a magnetic field of $\vec{B}$ induction , the force on it is non- zero. This implies that

angle between $\vec{v} and \vec{B}$ is necessarily 90^o
angle between $\vec{v} and \vec{B}$ can have any value other than 90^o
angle between $\vec{v} and \vec{B}$ can have any value other than 180^o
angle between $\vec{v} and \vec{B}$ is either zero or 180^o

45.

A steady current of 1.5 A flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is 30x 10^-5 g C^-1 , the mass of copper deposited on the electrode will be

0.40 g
0.50 g
0.67 g
0.27 g

46.

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

47.

Taking the earth to be a spherical conductor of diameter 12.8×10³ km. Its capacity will be

711 μF
611 μF
811 μF
511 μF

48.

A charge Q is distributed uniformly in a sphere (solid). Then, the electric field at any point r, where, r < R (r is the radius of sphere) varies as:

$r^{\frac{1}{2}}$
r ^-1
r
r ^-2

49.

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 [coordinates (O, a)] to another point B [coordinates (a, O)] along the straight path AB is

zero
$(\frac{- qQ}{4 {πε}_{o}} \frac{1}{a^{2}}) \sqrt{2} a$
$(\frac{qQ}{4 {πε}_{o}} \frac{1}{a^{2}})$
$(\frac{qQ}{4 {πε}_{o}} \frac{1}{a^{2}}) \sqrt{2} a$

50.

A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moments given by

$\frac{q ν R}{2}$
qνR²
$\frac{q ν R^{2}}{2}$
qνR

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NEET Physics : Electrostatic Potential and Capacitance

Multiple Choice Questions