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A bar magnet of the magnetic moment 5 Am^2 has poles 20 cm apart. Calculate the pole strength.(a) 250 Am(b) 4 Am(c) 100 Am(d) 25 AmI had been asked this question in quiz.My question is taken from Bar Magnet in section Magnetism and Matter of Physics – Class 12

Answer»

Right OPTION is (d) 25 Am

The EXPLANATION is: Magnetic DIPOLE moment = Pole STRENGTH × Magnetic length.

Pole strength = \(\frac {Magnetic \, dipole \, moment}{Magnetic \, length}\)

Pole strength = \(\frac {5}{0.2}\)

Pole strength = 25 Am.



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