JAMB Physics 1985 Question 43

Question 43

Magnetism

On which of the following does the operation of a moving coil ammeter depend? I. Electromagnetic induction II. Force on a current-carrying conductor in a magnetic field. III. Magnetic effect of an electric current

A.I only
B.II only
C.III only
D.II and III
E.I, II and III.

Show the answer and explanation

Answer: B (II only)

Explanation

The current-carrying coil sits in a magnet's field and feels a turning force; that force turns the pointer.