A magnet suspended in a uniform magnetic field is heated so as to reduce its magnetic moment by 19 % , By doing this, the time period of the magnet approximately

Step-by-step solution

Time period of suspended magnet in uniform magnetic field is T ₁=2 I MB When the magnetic moment is reduced by 19 % , then aligned & T ₂=2 I 0.81 MB = 1 0.9 (2 I MB )= T ₁ 0.9 & ~T ₂=1.11 ~T ₁ aligned % increase in time period is T %= ( T ₂- T ₁ ~T ₁ 100 ) %= ( 1.11 ~T ₁- T ₁ ~T ₁ ) 100=11 %