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PhysicsNEET 2021Torque on a current loop, moving-coil galvanometer

Moving Charges and Magnetism

A uniform conducting wire of length 12a12a and resistance RR is wound up as a current-carrying coil in the shape of (i) an equilateral triangle of side aa, (ii) a square of side aa. The magnetic dipole moments of the coil in each case respectively are:

  1. A.3 Ia2\sqrt3\,Ia^2 and 3Ia23Ia^2✓
  2. B.3Ia23Ia^2 and Ia2Ia^2
  3. C.3Ia23Ia^2 and 4Ia24Ia^2
  4. D.4Ia24Ia^2 and 3Ia23Ia^2

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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