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JAMB Physics 2014 Question 33

Question 33

Electrostatics

When a negatively-charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf

  1. A.collapses.
  2. B.collapses and diverges again.
  3. C.diverges.
  4. D.remains the same.
Show the answer and explanation

Answer: A (collapses.)

Explanation

The negative rod attracts positive charge up to the cap (electrons move down and neutralise the leaf), so the leaf loses its charge and collapses.