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Conventional current

The electric ...

Question

The electric field strength at a distance $r$ from a charge $q$ is $E$ . What will be electric field strength if the distance of the observation point is increased to $2 r$ ?

A

E / 2

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B

E / 4

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C

E / 6

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D

None of these

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Solution

The correct option is B $E / 4$
As new distance $= 2 r$ and electric field due to single charge, $E \propto \frac{1}{r^{2}}$ , therefore, new intensity $= E / 4$ .

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