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NTA Abhyas JEE Main2020PhysicsMagnetic Effects of CurrentPractice

Four very long wires are arranged as shown in the figure, so that their cross-section forms a square, with connections at the ends so that current I flow through all four wires. Length of each side of the formed such square is b . The magnetic field at the central point P (centre of the square) is

Options

  1. Aμ 0 I π b
  2. B2 μ 0 I π b
  3. C0
  4. Dμ 0 I 2 π b

Correct answer

B. 2 μ 0 I π b

Step-by-step solution

net field = 2 2 B where B = μ 0 I 2 π ( b 2 2 ) ∴ net field = 2 μ 0 I π b

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