A capacitor is kept connected to a battery and a dielectric slab is inserted between the plates. During the process

Work is done at the cost of the battery

Work is done at the cost of the capacitor

Work is done at the cost of the battery and capacitor

E M B I B E

Physics Crash Course JEE Advanced>Chapter 13 - Electrostatics>Exercise 1>Q 54

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IMPORTANT

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Two free point charges $+ q$ and $+ 4 q$ are placed a distance $x$ apart. A third charge is so placed that all the three charges are in equilibrium. Then

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Important Questions on Electrostatics

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Physics Crash Course JEE Advanced>Chapter 13 - Electrostatics>Exercise 1>Q 55

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

EASY

Physics

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Physics Crash Course JEE Advanced>Chapter 13 - Electrostatics>Exercise 1>Q 56

An uncharged conducting ball $B$ lies inside a charged conductor $A$ as shown in the figure. $B$ is isolated from $A$ .

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Physics Crash Course JEE Advanced>Chapter 13 - Electrostatics>Exercise 1>Q 57

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)

HARD

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Physics Crash Course JEE Advanced>Chapter 13 - Electrostatics>Exercise 1>Q 58

A point charge $q$ is within an electrically neutral conducting shell whose outer surface is a sphere of radius $R$ . The centre of outer surface is at $O$ . Consider a point $P$ outside the conductor as shown in the figure. The magnitude of electric field at $P$

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