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Question 20195
JEE Physics · Medium

Magnetism: Current Loop as Dipole MCQ

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Current Loop as DipoleMediumQuestion 20195

Question

Far from a small current loop, the magnetic field pattern is identical to that of:
  1. A
    A long solenoid
  2. B
    A magnetic dipole
    Correct
  3. C
    A straight wire
  4. D
    A parallel plate capacitor

Correct answer

A magnetic dipole

Explanation

A small current loop has magnetic moment m = IA. Its far field is a dipole field exactly analogous to an electric dipole, with B ∝ 1/r³.

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