Question

# A charge q1 exerts a force of 45N on a charge of q2=10−5C 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)(10−5)(0⋅2)2⇒q1=45×0⋅2×0⋅29×109×10−5⇒q1=2×10−5C

0
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