Questions
Time period for a magnet is T. If it is divided in four equal parts along its axis and perpendicular to its axis as shown, then time period for each part will be
detailed solution
Correct option is C
When magnet of length l is cut into four equal parts, thenm'=m2 and l'=l2; ∴M'=m2 x l2=ml4=M4New moment of inertiaI'=w'l'212=w4.l2212=116.wl212Here w is the mass of magnet.∴I'=116ITime period of each Part, T'=2πI'M'BH=2πI/16M/4BH=2πI4MBH=T2Similar Questions
The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be
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