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JEE Main20199 Apr 2019Morning ShiftPhysicsMagnetic Effects of CurrentActual

A rectangular coil (Dimension 5 c m × 2.5 c m ) 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 - a x i s . If the coil is tilted through 45 ° about Z - a x i s , then the torque on the coil is:

Options

  1. A0.42 N m
  2. B0.55 N m
  3. C0.38 N m
  4. D0.27 N m

Correct answer

D. 0.27 N m

Step-by-step solution

T o r q u e =   M → × B → = M B s i n θ = n i A B s i n θ = 100 × 3 × 5 × 10 - 2 × 2.5 × 10 - 2 × 1 × s i n 45 o = 0.27   N   m

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