Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 43

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An oil drop has a charge $- 9.6 \times 10^{- 19} C$ and mass $1.6 \times 10^{- 15} gm$ . When allowed to fall, due to air resistance force it attains a constant velocity. Then if a uniform electric field is to be applied vertically to make the oil drop ascend up with the same constant speed, which of the following are correct. $(g = 10 {ms}^{- 2})$ (Assume that the magnitude of resistance force is same in both the cases)

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 44

A non-conducting solid sphere of radius

R

is uniformly charged. The magnitude of the electric field due to the sphere at a distance

r

from its centre-

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 45

A uniform electric field of strength $E$ exists in a region. An electron (charge $- e$ , mass $m$ ) enters a point $A$ with velocity $V \hat{j}$ . It moves through the electric field and exits at point $B$ .Then:

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 46

Which of the following quantites depends on the choice of zero potential or zero potential energy ?

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 47

The electric field intensity at a point in space is equal in magnitude to

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 48

The electric field produced by a positively charged particle, placed in an

xy

-plane is

7.2 (4 i + 3 j) N C^{- 1}

at the point

(3 cm, 3 cm)

and

100 \hat{i} N C^{- 1}

at the point

(2 cm, 0)

.

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 49

At a distance of

5 cm

and

10 cm

outwards from the surface of a uniformly charged solid sphere, the potentials are

100 V

and

75 V

, respectively. Then,

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 50

The electric potential decreases uniformly from

180 V

to

20 V

as one moves on the

x

-axis from

x = - 2 cm

to

x = + 2 cm

. The electric field at the origin,

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 51

An electric dipole is kept in the electric field produced by a point charge.