Solution:
b ) Torque on the loop = I A B
where I = 30 mA = 0.030 A
Magnetic field = B = 0.4 T
Area = A = pi R^2 = pi (0.10)^2 = 0.0314 m^2
Torque = (0.030)(0.0314)(0.4) = 3.77 x10^-4 N m
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