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JAMB Physics 1987 Question 41

Question 41

Electrostatics

In Fig. 5 above, M and N are insulated metal spheres in contact. A negatively charged ebonite rod P is brought near M. When M and N are separated and the rod is taken away, which of the following statements is CORRECT?

Diagram for this question
  1. A.Both M and N have acquired negative charges.
  2. B.Both M and N have acquired positive charges
  3. C.M has acquired negative charge and N positive charge
  4. D.M has acquired positive charge and N negative charge.
Show the answer and explanation

Answer: D (M has acquired positive charge and N negative charge.)

Explanation

The negative rod repels electrons from M into N. Separating the spheres traps the charges: M (near the rod) is positive and N is negative.