Two positive point charges of unequal magnitu | vedclass

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Question

(A) At the null point $N$,the net electric force on the test charge $q$ is zero,so it is in equilibrium.If the test charge $q$ is displaced slightly a

Vedclass · Accepted Answer

The test charge is in unstable equilibrium.

Vedclass · Answer

(A) At the null point $N$,the net electric force on the test charge $q$ is zero,so it is in equilibrium.If the test charge $q$ is displaced slightly along the line joining the two charges,it will experience a restoring force,meaning it is in stable equilibrium along this axis.However,if the test charge $q$ is displaced slightly perpendicular to the line joining the two charges,the components of the electric forces from $Q_1$ and $Q_2$ will act in the same direction as the displacement,pushing the charge further away from the null point.Since the equilibrium is unstable for displacements perpendicular to the line joining the charges,the overall state of equilibrium is considered unstable.

Two positive point charges of unequal magnitude are placed at a certain distance apart. $A$ small positive test charge $q$ is placed at the null point $N$. Then,

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