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MHT CET202013 Oct 2020Morning ShiftPhysicsMagnetic Effects of CurrentActual

A bar magnet of magnetic moment 5 Am ² is placed in a uniform magnetic induction 3 10⁻⁵ ~T . If each pole of a magnet experiences a force of 2 5 10⁻⁴ ~N then the magnetic length of the magnet is

Options

  1. A0.8 ~m
  2. B0 2 ~m
  3. C0.6 ~m
  4. D0 4 ~m

Correct answer

C. 0.6 ~m

Step-by-step solution

F = mB where m is pole strength. m = F B = 2.5 10⁻⁴ 3 10⁻⁵ = 25 3 Am Magnetic moment M = mL L = M m = 5 3 25 =0.6 ~m

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