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Q.

A metallic sphere has a charge of 10 μC. A unit negative charge is brought from A to B both 100 cm away from the sphere but A being east of it while B being on west. The net work done is

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a

Zero

b

2/10 joule

c

−2/10 joule

d

−1/10 joule

answer is A.

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Detailed Solution

Since VA=VB so WA→B=0
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