passwella.
Menu

JAMB Physics 1993 Question 32

Question 32

Electrostatics

The field that results from the contact of a positively charged ball with the inner wall of an uncharged hollow conducting sphere is

  1. A.inside the sphere
  2. B.on the surface of the ball
  3. C.inside and outside the sphere
  4. D.outside the sphere.
Show the answer and explanation

Answer: D (outside the sphere.)

Explanation

When the ball touches the inside wall, all its charge flows to the outer surface of the hollow conductor. There is then no field inside, only outside.