A charge Q is distributed over three concentric spherical shells of radii a , b , c a < b < c such that their surface charge densities are equal to one another. The total potential at a point at distance r from their common centre, where r < a , would be:

Q a + b + c 4 π ϵ 0 a 2 + b 2 + c 2

Q a 2 + b 2 + c 2 4 π ϵ 0 a 3 + b 3 + c 3

Q 12 π ϵ 0 a b + b c + c a a b c

E M B I B E

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 28

MEDIUM

NEET

IMPORTANT

Earn 100

Two parallel charged plates have a charge density $+ σ$ and $- σ .$ The resultant force on the proton located outside the plates at some distance will be -

50% studentsanswered this correctly

Important Questions on Electrostatics

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 29

The charge density of an insulating infinite surface is

(\frac{e}{π}) C m^{- 2}

then the field intensity at a nearby point in volt/meter will be -

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 30

There is a uniform electric field in

X

-direction. If the work done by an external agent in moving a charge of

0.2 C

through a distance of

2 m

slowly along the line making an angle of

60 °

with

X

-direction is

4 joule

, then the magnitude of

E

is

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 31

A simple pendulum has a length $ℓ,$ mass of bob $m .$ The bob is given a charge $q$ coulomb. The pendulum is suspended to a uniform horizontal electric field of strength $E$ as shown in the figure, then calculate the time period of oscillation when the bob is slightly displaced from its mean position is:

Question Image

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 32

Charge $2 Q$ and $- Q$ are placed as shown in figure. The point at which electric field intensity is zero will be:

Question Image

HARD

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 33

The maximum field intensity on the axis of a uniformly charged ring of charge

q

and radius

R

will be,

HARD

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 34

A charge particle of mass

m

and charge

q

is released from rest in a uniform electric field

E

. Neglecting the effect of gravity, the kinetic energy of the charged particle after

‘ t ’

second is -

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 35

The electric field above a uniformly charged nonconducting sheet is

E

. If the nonconducting sheet is now replaced by a conducting sheet with the charge same as before, the new electric field at the same point is:

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 36

The linear charge density on upper half of a segment of ring is $λ$ and at lower half, it is $- λ .$ The direction of electric field at centre $O$ of ring is:

Question Image