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Electric Field

A point charg...

Question

A point charge produces an electric field of magnitude $5.0 N C^{- 1}$ at a distance of 40 cm from it. What is the magnitude of the charge?

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Solution

$E = \frac{1}{4 π ϵ_{0}} \frac{q}{r^{2}} 5.0 = 9 \times 10^{9} \times \frac{q}{0.4 \times 0.4} q = 8.9 \times 10^{- 11} C .$

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