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51.

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.
Discussion
52.

Magnetic lines of force always form open loops. State true or false.(a) True(b) FalseThe question was asked in final exam.My question is from Bar Magnet topic in chapter Magnetism and Matter of Physics – Class 12

Answer»

Right answer is (B) False

Easy explanation: Magnetic poles always exist in pairs. So magnetic lines of FORCE RUN from N-pole to S-pole outside the MAGNET and from S-pole to N-pole INSIDE the magnet. They do not start or end anywhere and always forms closed loops.
Discussion