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A positively charged ball hangs from a silk thread. If a positive test charge $q_0$ is placed at a point and $F/q_0$ is measured, then the electric field strength $E$ is

1. $F/q_0 > E$
2. $F/q_0 = E$
3. $F/q_0 < E$
4. Cannot be estimated

Correct answer: $F/q_0 = E$

Solution

Electric field at a point is defined as force per unit positive test charge, $E=F/q_0$. Therefore the measured quantity equals the electric field strength, provided the test charge is sufficiently small.

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