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JEE Main202126 Aug 2021Evening ShiftPhysicsMagnetic Effects of CurrentActual

A coil in the shape of an equilateral triangle of side 10 cm lies in a vertical plane between the pole pieces of permanent magnet producing a horizontal magnetic field 20 mT . The torque acting on the coil when a current of 0 . 2 A is passed through it and its plane becomes parallel to the magnetic field will be x × 10 - 5 Nm . The value of x is

Correct answer

0

Step-by-step solution

τ = M → × B → = I A B = 0 . 2 × 3 a 2 4 × 2 × 10 - 2 = 0 . 2 × 3 × 10 - 2 × 2 × 10 - 2 4 = 3 × 10 - 5   N   m

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