Working with electrostatic force - unknown charge problem
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A positive charge of 2X10-12 Coulombs placed 10cm from another charge experiences a repulsive force of 9X10-9 Newtons. What is the sign and magnitude of the other charge?
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Since the charge experiences a repulsive force, the sign of the other charge is positive.
(same charges repells)
we have, F = AQ1q2/R^2 .....(1)
where A = 9x10^9
F = 9x10-9 N
Q1= 2x10-12 C
R = 10 cm = 10x10^-2m ...
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