NEET 2002 Physics question
Not in JEE Advanced syllabus
Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similar poles are same side then its time period of oscillation is . Now the polarity of one of the magnet is reversed then time period of oscillation is , then :
Answer: (1)
Solution
For a combination of magnets in a field , , so (the moment of inertia is the same in both cases since the geometry is the same). Case I (similar poles on the same side, i.e. moments parallel): . Case II
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