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Q.

A sphere carrying charge 0.01 C is kept at rest without falling down, touching a wall by applying an electric field 100 N/C. If the coefficient of friction between the sphere and the wall is 0.2 , the weight of the sphere is 

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a

20 N

b

4N

c

0.2 N

d

2 N

answer is D.

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Detailed Solution

 mg = µqE 

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