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A point charge q is located at the centr...

A point charge `q` is located at the centre `O` of a spherical uncharged coducting layer provided with small orifice. The inside and outside radii of the layer are equal to a and `b` respectively. The amount of work that has to be performed to slowly transfer the charge `q` from teh point `O` through the orifice and into infinity is

A

`(q^2)/( 8 pi epsilon_(0) ) ((1)/( a) - (1)/(b))`

B

`(q^2)/(4 epsilon_(0)) ((1)/(b) - (1)/(a))`

C

`(q^2)/( 8 pi epsilon_(0) ) ((1)/(b)- (1)/( a))`

D

`(q^2)/(4 pi epsilon_(0)) ((1)/( a) - (1)/(b))`

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The correct Answer is:
A
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