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MHT CET2011PhysicsMagnetic Effects of Current

A current passing through a circular coil of two turns produces a magnetic field B as its centre. The coil is then rewound so as to have four turns and the same current is passed through it. The magnetic field at its centre now is

Options

  1. A2 B
  2. BB / 2
  3. CB / 4
  4. D4 B

Correct answer

A. 2 B

Step-by-step solution

According to questions array l 2 2 ₁=4 2 r₂ r₁=2 r₂ and B₁= ₀ 2 I 4 r₁ B₂= ₀ 2 I 4 r₂ = ₀ 2 I 4 r₁ / 2 B₂=2 B₁ array

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