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NEET2003PhysicsMagnetic Properties of MatterActual

A bar magnet is oscillating in the Earth's magnetic field with a period T . What happens to its period and motion if its mass is quadrupled?

Options

  1. Amotion remains simple harmonic with time period = T 2
  2. Bmotion remains S.H.M with time period =2 T
  3. Cmotion remains S.H.M. with time period =4 T
  4. Dmotion remains S.H.M and period nearly constant

Correct answer

B. motion remains S.H.M with time period =2 T

Step-by-step solution

Time period of bar magnet T =2 I 14 H Where I = M.I. = m ~L ^2 12 m= mass of magnet T=2 mL^2 12 MH T m If mass is quadruplet then T becomes twice.

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