A big positive charge exerts a force F on a small positive c... | Physics - Coulomb's Law and Electric Forces | SolveeIt | Solveeit

Today, August 19

Question

A big positive charge exerts a force F on a small positive charge and the small positive charge exerts a force F' on the big positive charge then

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A

$\frac{F'}{F}>1$

B

$\frac{F'}{F}<1$

C

$\frac{F'}{F}=1$

D

$\overrightarrow{F'}=\overrightarrow{F}$

Answer

$\frac{F'}{F} = 1$

Explanation

Solution

According to Newton's third law, if a charge $Q_1$ exerts a force $\mathbf{F}$ on charge $Q_2$ , then $Q_2$ exerts a force $\mathbf{F'}$ on $Q_1$ such that:

\mathbf{F}' = -\mathbf{F}.

This implies that the magnitudes of $\mathbf{F}$ and $\mathbf{F'}$ are equal, i.e.,

\frac{F'}{F} = 1.

Thus, only option (3) is correct.