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Q.

If two bar magnets of different magnetic lengths have equal moments, then the pole strength is  

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a

more for shorter magnet

b

more for longer magnet

c

lesser for shorter magnet

d

equal for both magnets  

answer is D.

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Detailed Solution

M=2lm

M is same 

m12l

Pole strength is more for shorter magnet.   

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If two bar magnets of different magnetic lengths have equal moments, then the pole strength is