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Q.

A charged sphere of radius 0.02 m has charge density of 1 Cm–2. The work done when a charge of 40 nC is moved from infinity to a point that is at a distance of 0.04 m from the center of the sphere

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a

2 J

b

14.4πJ

c

1.44πJ

d

1.44J

answer is C.

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Detailed Solution

V=σ4πε04πr2RW=qV=1×9×109×4π(0.02)2(0.04)=14.4πJ

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