Q.

If an uncharged metal plate is in contact with negatively charged sphere, metal plate becomes

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a

always positive

b

may be negative

c

always negatively charged

d

always positively charged

answer is A.

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Detailed Solution

By conceptual

 An uncharged body comes in contact with charged body. Then body also charged because electrons enter into the uncharged body. So uncharged body becomes negatively charged(mass is slightly increases)

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