NEET2015PhysicsMagnetic Effects of CurrentActual
A rectangular coil of length 0.12  m and width 0.1  m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 W e b e r / m 2 . The coil carries a current of 2 A . If the plane of the coil is inclined at an angle of 30 o with the direction of the field, the torque required to keep coil in stable equilibrium will be:
Options
- A0.20 N m
- B0.24 N m
- C0.12 N m
- D0.15 N m
Correct answer
A. 0.20 N m
Step-by-step solution
τ → =   M →   ×   B →   = M B sin ⁡ 60 o = N i   A B sin ⁡ 60 o = 50   × 2 × 0.12   × 0.1   × 0.2   ×   3 2 = 12 3   × 10 - 2   N m = 0.20748   N m