Solution Found!
A point charge +Q is fixed at a height H above the ground.
Chapter 19, Problem 8CQ(choose chapter or problem)
Problem 8CQ
A point charge +Q is fixed at a height H above the ground. Directly below this charge is a small ball with a charge −q and a mass m. When the ball is at a height h above the ground, the net force (gravitational plus electrical) acting on it is zero. Is this a stable equilibrium for the object? Explain.
Questions & Answers
QUESTION:
Problem 8CQ
A point charge +Q is fixed at a height H above the ground. Directly below this charge is a small ball with a charge −q and a mass m. When the ball is at a height h above the ground, the net force (gravitational plus electrical) acting on it is zero. Is this a stable equilibrium for the object? Explain.
ANSWER:
Step 1 of 2
If the ball is displaced slightly upward from the equilibrium position, the attractive electrostatic force will be larger than the gravitational force, which will displace the ball farther upward.