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A rectangular coil (Dimension 5 cm x 2.5 cm) with 100 turns, carrying a current of 3 A in the clock-wise direction, is kept centered at the origin and in the X-Z plane. A magnetic field of 1 T is applied along X-axis. If the coil is tilted through 45º about Z-axis, then the torque on the coil is - 

(1) 0.55 Nm  (2) 0.38Nm  (3) 0.42 Nm  (4) 0.27 Nm

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Correct option  (4) 0.27 Nm


 = M x B = NIA B sinθ

= 100 x 3 x 5 x 2.5 x 10–4 x 1 x sin 45º 

 = 0.27 Nm 

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