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JEE Main202229 Jul 2022Morning ShiftPhysicsMagnetic Effects of CurrentActual

A wire of length 314   cm carrying current of 14   A is bent to form a circle. The magnetic moment of the coil is A - m 2 . [Given π = 3 . 14 ]

Correct answer

11

Step-by-step solution

Length of the wire l when bent becomes circumference of the loop, whose radius is given by R = l 2 π = 314 100 2 × 3 . 14 = 1 2   m Magnetic moment of the coil is M = I A = 14 × π R 2 = 14 × 3 . 14 × 1 4 = 10 . 99 ≈ 11 . 00   A - m 2

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