If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________?
Correct answer: B. remain in stable equilibrium
- A. move out of the field of influence of the two charges
- B. remain in stable equilibrium
- C. not be in equilibrium
- D. be in unstable equilibrium
Explanation
At the midpoint, the two repulsive forces on the third charge are equal and opposite, so the net force is zero. A small displacement produces a stronger repulsion from the nearer outer charge, pushing it back toward the midpoint, so the equilibrium is stable.
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