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A current-carrying loop is shown in the figure. The magnitude of the magnetic field produced at a point O is

Options

  1. Aμ 0 I 4 R 1 + 2 π
  2. Bμ 0 I 4 R 1 - 2 π
  3. Cμ 0 I 2 R 1 + 2 π
  4. Dμ 0 I 4 R 1 + 2 2 π

Correct answer

A. μ 0 I 4 R 1 + 2 π

Step-by-step solution

B 0 = μ 0 I 2 R × 1 2 + 4 × μ 0 I 4 π × 2 R × 1 2 B 0 = μ 0 I 4 R 1 + 2 π

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