1.

A particle of mass M and charge q , initially at rest , is accelerated by a uniform electric field E through a distance D and is then allowed to approach a fixed static charge Q of the same sign . The distance of the closest approach of the charge q will then be

Answer»

`(Q)/(4piepsilon_(0)D)`
`(Q)/(4piepsilon_(0)ED)`
`(qQ)/(2piepsilon_(0)D^(2))`
`(Q)/(4piepsilon_(0)E)`

SOLUTION :Force acting on charge q is in uniform ELECTRIC field E is
`threfore` WORK done on particle by electric field.
W=qED.
`thereforeQED=(1)/(4piepsilon_(0))rArrr_(0)=(Q)/(4piepsilon_(0)ED)`


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