If you disturb the position of a test charge from its equilibrium point, located between a pair of stationary positive charges, what motion of the test charge occurs?
A)It always returns to its equilibrium position.
B)It returns to its equilibrium position if it has negative charge.
C)It moves away from its equilibrium position if it has positive charge.
D)It never returns to its equilibrium position, and the equilibrium is unstable.

Question

Quizplus · Accepted Answer

The equilibrium is unstable because any small disturbance will cause the test charge to experience a net force that moves it away from the equilibrium position, regardless of its charge.

If You Disturb the Position of a Test Charge from Its