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How to Visualize Electric Fields

Two equal and...

Question

Two equal and similar charges, one metre apart repel each other with the force of $9.8$ N. Find the magnitude of charges.

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Solution

Given force =9.8 N
Since $q_{1} = q_{2}$ as per question.
From coulomb's law
F= $= \frac{k q_{1} q_{2}}{r^{2}} = \frac{k {q_{1}}^{2}}{r^{2}} {q_{1}}^{2} = \frac{F r^{2}}{k} = 1.08 \times 10^{- 9} q_{1} = \sqrt{1.08 \times 10^{- 9}} C$

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