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JEE Main20248 Apr 2024Evening ShiftPhysicsMagnetic Effects of CurrentActual

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

Options

  1. A1: 4
  2. B1: 1
  3. C3: 4
  4. D4: 1

Correct answer

B. 1: 1

Step-by-step solution

aligned & B ₁ 2 a 2 = _ o I 4 & ~B ₁= _ o I 4 a & B ₂ 2 2 a = _ o I & B ₂= _ o I 4 a aligned

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