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BITSAT2024PhysicsMagnetic Effects of CurrentActual

A long straight wire of radius a carries a steady current 1 . The current is uniformly distributed across its cross section. The ratio of the magnetic field at a 2 and 2a from axis of the wire is:

Options

  1. A1: 4
  2. B4: 1
  3. C1: 1
  4. D3: 4

Correct answer

C. 1: 1

Step-by-step solution

Magnetic field due to straight wire, B= ₀ I 2 r Magnetic field at a 2 is, B _ a / 2 = ₀ I 2 ( a / 2) B _ a / 2 ~B _ 2 a = 1 1 =1: 1

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