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MCQ

Question

The magnetic field strength due to a short bar magnet at a distance r from the mid point of the magnet is B. Find the magnetic field strength at a distance 2r from the mid point of the magnet.

Choose one · Correct answer highlighted

\(\frac{B}{2}\) \(\frac{B}{4}\) \(\frac{B}{8}\) Correct None of these

Axial field Ba=μ0/4π 2M/r^3, equatorial Be=μ0/4π M/r^3, Ba=2Be.

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