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JEE Main202127 Aug 2021Morning ShiftPhysicsMagnetic Effects of CurrentActual

A uniform conducting wire of length is 24 a , and resistance R is wound up as a current carrying coil in the shape of an equilateral triangle of side a and then in the form of a square of side a . The coil is connected to a voltage source V 0 . The ratio of magnetic moment of the coils in case of equilateral triangle to that for square is 1 : y where y is ____________.

Correct answer

0

Step-by-step solution

4 a n 1 = 24 a thus n 1 = 6 turns 3 an 2 = 24 a ⇒ n 2 = 8 turns M 1 M 2 = n 1 i A 1 n 2 i A 2 = 6 × a 2 8 × a 2 × 3 4 = 3 1 M 2 M 1 = 1 3 = 1 y y = 3

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