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A charged particle of charge 'Q' is held...

A charged particle of charge 'Q' is held fixed and another charged particle of mass 'm' and charge 'q' (of the same sign) is released from a distance 'r'. The impulse of the force exerted by the external agent on the fixed charge by the time distance between 'Q' and 'q' becomes `2 r` is

A

`sqrt((Qq)/(4piin_0mr))`

B

`sqrt((Qq)/(4piin_0r))`

C

`sqrt((Qq)/(piin_0r))`

D

`sqrt((Qq)/(4piin_0r))`

Text Solution

Verified by Experts

The correct Answer is:
B
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