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JEE Main2002PhysicsMagnetic Effects of CurrentActual

If in a circular coil A of radius R , current I is flowing and in another coil B of radius 2 R a current 2 l is flowing, then the ratio of the magnetic fields B _ A and B _ B , produced by them will be

Options

  1. A1
  2. B2
  3. C1/2
  4. D4

Correct answer

A. 1

Step-by-step solution

In coil A, B = ₀ 4 2 I R . B I R ; Hence, B ₁ ~B ₂ = I ₁ R ₁ R ₂ I ₂ = 2 2 =1

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