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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