Question

To measure the magnetic moment of a bar magnet, one may use (a) a tangent galvanometer

Answer 1

Q) To measure the magnetic moment of a bar magnet, one may use 
(a) a tangent galvanometer 
(b) a deflection galvanometer if the earth's horizontal field is known 
(c) an oscillation magnetometer if the earth's horizontal field is known 
(d) both deflection and oscillation magnetometer if the earth's horizontal field is not known.

Answer : d) both deflection and oscillation magnetometer if the earth's horizontal field is not known

Answer 2

Answer:

(b),(c),(d)

Explanation:

tamgemt galvanometer cannot be used to measure the magnetic moment of a magnet