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NEET2025PhysicsMagnetic Effects of CurrentActual

A 2 amp current is flowing through two different small circular copper coils having radii ratio 1: 2 . The ratio of their respective magnetic moments will be

Options

  1. A1: 4
  2. B1: 2
  3. C2: 1
  4. D4: 1

Correct answer

A. 1: 4

Step-by-step solution

aligned & Magnetic moment M = I ( ~A ) & aligned & M = I ( r ^2 ) & M ₁ M ₂ = I r₁^2 I r₂^2 = ( r₁ r₂ )^2= ( 1 2 )^2 & M ₁ M ₂ = 1 4 aligned aligned

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