MHT CET Physics question
Not in JEE Advanced syllabus
A bar magnet of negligible thickness is suspended horizontal from a thin fiber in a uniform magnetic field and oscillates with a period 2 s then the magnet is cut along the axis of a bar magnet, then period of oscillation of the magnet will be
Answer: (A)
Solution
Cutting along the axis halves the pole strength, so , and halves the mass, so (length unchanged);
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