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Question: A circular coil of radius 4 cm and 20 turns carries a current of 3 ampere. It is placed in a magneti...

A circular coil of radius 4 cm and 20 turns carries a current of 3 ampere. It is placed in a magnetic field of 0.5 T. The magnetic dipole moment of the coil is

A

0.60 A-m2

B

0.45 A-m2

C

0.3 A-m2

D

0.15 A-m2

Answer

0.3 A-m2

Explanation

Solution

M = niA ⇒ M = 20 × 3 × π ( 4 × 10–2)2 = 0.3 A-m2.