(A), (B) and (C) respectively are...

(A), (B) and (C) respectively are

A

`-(qQ)/(6 pi in_(0)L)`

B

`(qQ)/(4 pi in_(0)L)`

C

`(qQ)/(2 pi in_(0)L)`

D

`(qQ)/(6 pi in_(0)L)`

Verified by Experts

The correct Answer is:

A

`W= DeltaU=Q(V_(D)-V_(C))` here `V_(C)=0`
`=Q[(q)/(4 pi in_(0)(3l))-(q)/(4 pin in_(0)(L))-0]=(-Qq)/(6pi in_(0)L)`

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