Physics · Electrostatics
Consider two identical charged balls, each of mass m and charge q. One of them is initially held fixed on a frictionless insulating horizontal surface and the other is carefully placed above the first one at a height h from the surface, such that the gravitational force on it is balanced by the Coulomb repulsion. The upper ball is now shifted horizontally by a small distance d (d << h) to the right and then both balls are released. Which way will the balls move immediately after release?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The ball on the surface moves towards the right, and the ball above moves upwards.
- 2Both balls remain static at their new positions.
- 3Both balls oscillate around their original positions.
- 4The ball on the surface moves towards the left, and the ball above moves downwards.✓
Correct answer
The ball on the surface moves towards the left, and the ball above moves downwards.
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