Question
Question: A circular loop of area 1 cm<sup>2</sup>, carrying a current of 10 A, is placed in a magnetic field ...
A circular loop of area 1 cm2, carrying a current of 10 A, is placed in a magnetic field of 0.1 T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is
A
Zero
B
10–4 N-m
C
10–2 N-m
D
1 N-m
Answer
1 N-m
Explanation
Solution
The direction of the magnetic force will be vertically downwards at each element of the wire.
Thus F = Bil = Bi (2πa) = 2πiaB.