Q.

A uniform magnetic field of 0.3 T is established along the positive Z-direction. A rectangular loop in XY plane of sides 10 cm and 5 cm carries a current of I=12 A as shown. The torque on the loop is :

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a

-1.8x10-2 j^Nm

b

Zero

c

-1.8x10-2 i^Nm

d

+1.8x10-2 i^Nm

answer is B.

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Detailed Solution

Magnetic moment  M → due to the loop is downward and θ=1800  between M →& B → τ=M  B   sin  1800  =0
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A uniform magnetic field of 0.3 T is established along the positive Z-direction. A rectangular loop in XY plane of sides 10 cm and 5 cm carries a current of I=12 A as shown. The torque on the loop is :