The drawings show three charges that have the same magnitude but may have differ

Question

The drawings show three charges that have the same magnitude but may have different signs. In all cases the distance d between the charges is the same. The magnitude of the charges is |q|=9.9 ?C, and the distance between them is d=4.0 mm. Determine the magnitude of the net force on charge 2 for each of the three drawings.

The drawings show three charges that have the same magnitude but may have different signs. In all cases the distance d between the charges is the same. The magnitude of the charges is |q|=9.9 ?C, and the distance between them is d=4.0 mm. Determine the magnitude of the net force on charge 2 for each of the three drawings.

Explanation / Answer

a) magnitude of net charge = 2*k*q^2 / d^2 = 2 * 9*10^9 * 9.9^2 * 10^-12 / ( 0.004^2 ) = 110261.25 N

b) magnitude of net charge = 0 ( as force fom each +q chage will be zero )

c) magnitude of net charge = root (2) * k*q^2 / d^2   = 77966.4775771 N

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