There are two equipotential surfaces as shown in figure. The distance between them is r. The char...

There are two equipotential surfaces as shown in figure. The distance between them is r. The charge of -q coulomb is taken from the surface A to B, the resultant work done will be
[MP PMT 1986; CPMT 1986, 88]
(a) W=1/4 πε_oq/r
(b) W=1/4 πε_0q/r^2
(c) W=-1/4 πε_0q/r^2
(d) W= zero

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