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A particle of mass 5 xx 10^(-6) g is kep...

A particle of mass `5 xx 10^(-6) g` is kept over a large horizantal sheet of charge of denisity `4.0 xx 10^(-6) C m^(-2)` (Figure 30-W5). What charge should be given to this partical so that if released, it does not fall down? How many electrons are to be removed to give this charge? How much mass is decreased due to the removal of these electrons?

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