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A 200N force is exerted on an unknown charge, q', by a charge of 6 x...

A 200N force is exerted on an unknown charge, q', by a charge of 6 x 10^-6 C. The charges are separated by 5 cm. What is the unknown charge?

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Answer #1

force between charges = kq1q2 / r^2

where q1,q2 are the charges

and r = separation between the charges

200 = 9*10^9*6*10^-6*q / 0.05^2

q = 9.26*10^-6 C

so the unknown charge is 9.26*10^-6 C

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