Question

In equilibrium for charges, when a charged body $(-q)$ is displaced from its equilibrium position, the net force is
$[$Assume charges $+Q$ to be fixed and consider only axial displacement$]$

• A. away from the original position
• B. towards the original position
• C. zero
• D. Any of the option $a$ or $b$

Answer 1

The correct option is A away from the original position

Suppose for the given arrangement of equilibrium along the axial line, if the charged body $(-q)$ is displaced from its equilibrium position then the net force will try to make it away from the original position.
Thus, net force $($Electrostatics Force$)$ on the charged body is away from the original position.
Here, $F_{32}>F_{31}$
$\Rightarrow {\overrightarrow{F}}_{net}={\overrightarrow{F}}_{32}-{\overrightarrow{F}}_{31}$
$($away from the original position$)$