Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 12

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Two equally charged identical small balls kept some fixed distance apart exert a repulsive force $F$ on each other. A similar uncharged ball, after touching one of them is placed at the mid-point of line joining the two balls. Force experienced by the third ball is

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Important Questions on Electric Charges and Fields

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 13

A charged gold leaf electroscope has its leaves apart by certain amount having enclosed air. When the electroscope is subjected to X-rays, then the leaves

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 14

Two equal positive charges

Q

are fixed at points

(a, 0)

and

(- a, 0)

on the

x

-axis. An opposite charge

- q

at rest is released from point

(0, a)

on the

y

-axis. The charge

- q

will

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 15

Four charges equal to

- Q

are placed at the four corners of a square and a charge

q

is at its centre. If the system is in equilibrium, the value of

q

is

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 16

According to Coulomb's Law, which is correct relation for the following diagram ?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 17

A charge

q

is to be distributed on two conducting spheres. What should be the value of the charges on the spheres so that the repulsive force between them is maximum when they are placed at a fixed distance from each other in air ?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 18

A point charge

q_{1}

exerts an electric force on a second point charge

q_{2} .

If third charge

q_{3}

is brought near, the electric force of

q_{1}

exerted on

q_{2}

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 19

Three charges

+ 4 q

,

Q

and

q

are placed in a straight line of length

l

at points at distances

0, \frac{l}{2}

and

l

respectively. What should be

Q

in order to make the net force on

q

to be zero?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 20

A particle of mass

m

and carrying charge

- q_{1}

is moving around a charge

+ q_{2}

along a circular path of radius

r .

Find period of revolution of the charge

- q_{1}