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JEE Main2004PhysicsMagnetic Effects of CurrentActual

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B . It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be

Options

  1. AnB
  2. Bn ^2 ~B
  3. C2 nB
  4. D2 n^2 B

Correct answer

B. n ^2 ~B

Step-by-step solution

B^ = ₀ I 2 r^ =n^2 ₀ =n^2 B .

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