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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

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