Problem2. A) Aperson scuffing her feet on the floor picks up a chargeof 50C,how

Question

Problem2.

A) Aperson scuffing her feet on the floor picks up a chargeof 50C,how many electrons has she

picked upfrom the floor?

B) Whentwo charges are 100 cm apart they exert an electric force of size0.01 N on each other. What

is thesize of the electric force that the charges exert on each otherwhen they are 10 cm apart?

Explanation / Answer

A) we know that           q = n e ==> n = q / e = - 50 x 10-6 / -1.6 x10-19 = 31.25 x1013 electrons B) We know that            F 1 / r2    So that we have           F1 / F2 =r22 / r12           F2 = 0.01 *1 / 0.01                = 1.0 N

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