Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 99

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The work done to take an electron from rest where potential is $- 60 V$ to another point where potential is $- 20 V$ is given by -

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Important Questions on Electrostatics

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Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-1>Q 100

If a charge is shifted from a low potential region to a high potential region. The electrical potential energy:

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

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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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: