Positive and negative point charges of equal magnitude are kept at 0,0 , a 2 and 0,0 , - a 2 , respectively. The work done by the electric field when another positive point charge is moved from - a , 0 , 0 to 0 , a , 0 is

depends on the path connecting the initial and final positions.

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

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 101

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A particle $A$ has charge $+ q$ and a particle $B$ has charge $+ 4 q$ with each of them having the same mass $m .$ When allowed to fall from rest through the same electric potential difference, the ratio of their speed $\frac{v_{A}}{v_{B}}$ will become

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Important Questions on Electrostatics

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 102

In an electron gun, electrons are accelerated through a potential difference of

V

volt. Taking electronic charge and mass to be respectively

e

and

m,

the maximum velocity attained by them is:

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 103

In a cathode ray tube, if

V

is the potential difference between the cathode and anode, the speed of the electrons, when they reach the anode is proportional to: (Assume initial velocity

= 0

)

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 104

An electron of mass

m

and charge

e

is accelerated from rest through a potential difference

V

in a vacuum. The final speed of the electron will be

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 105

Positive and negative point charges of equal magnitude are kept at

(0,0, \frac{a}{2})

and

(0,0, \frac{- a}{2})

, respectively. The work done by the electric field when another positive point charge is moved from

(- a, 0, 0)

to

(0, a, 0)

is

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 106

If a positive charge is shifted from a low potential region to a high potential region, the electric potential energy

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 107

An electron is accelerated by

1000

V

, potential difference, its final velocity is:

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 108

As per this diagram a point charge: $+ q$ is placed at the origin $O .$ Work done in taking another point path charge $- Q$ from the point $A$ [co-ordinates $(o, a)$ ] another point $B$ [co-ordinates $(a, o)$ ] along the straight path $A B$ is:

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 109

Two charges $q_{1}$ $q_{2}$ are placed $30 cm$ apart, as shown in the figure. A third charge $q_{3}$ is moved along the arc of a circle of radius $40 cm$ from $C$ to $D .$ The change in the potential energy of the system is $\frac{q_{3}}{4 π ε_{0}} k,$ where $k$ is: