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JEE Main 2003 Physics question

PhysicsMagnetism and MatterJEE Main 2003

A thin rectangular magnet suspended freely has a period of oscillation equal to . Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is , the ratio is

Answer: (2)

Solution

. For each half: mass halves and length halves, so ; pole strength is unchanged and length halves, so $M' =

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Question ID VK-038113