Question
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.