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JIPMER2010PhysicsMagnetic Effects of Current

An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B . The magnetic field at 20 cm from the straight wire would be

Options

  1. AB 6
  2. BB 4
  3. CB 3
  4. DB 2

Correct answer

B. B 4

Step-by-step solution

The magnetic field at a distance r from the straight wire aligned & B & = ₀ i 2 r or B 1 r or B₂ B₁ = r₁ r₂ & B₂ B & = 5 20 = 1 4 or B₂= B 4 aligned

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