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A cone made of insulating material has a...

A cone made of insulating material has a total charge Q spread uniformly over its sloping surface. Calculate the energy required to take a test charge q from infinity to apex A of cone. The slant length is L.
.

A

`(Qq)/(2pi epsilon_(0)L)`

B

`(Qq)/(4pi epsilon_(0)L)`

C

`-(Qq)/(3pi epsilon_(0)L)`

D

`(Qq)/(8pi epsilon_(0)L)`

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The correct Answer is:
A
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