Question

A charge q1 exerts a force of 45N on a charge of q2=105C located at a point 0.2m from q1. The magnitude of q1 is

A
4×108C
B
2×105C
C
3×106C
D
5×108C
Solution
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As we know electrostatic force between two charges F=kq1q2r2

45=(9×109)(q1)(105)(02)2

q1=45×02×029×109×105

q1=2×105C

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