A) equal for both the magnets
B) lesser for shorter magnet
C) more for longer magnet
D) more for shorter magnet
Correct Answer: D
Solution :
Given: Two bar magnets are of same moments. Hence, \[{{M}_{1}}={{M}_{2}}\] \[{{m}_{1}}{{l}_{1}}={{m}_{2}}{{l}_{2}}\] (\[\because M=ml\]where m is pole strength also \[{{l}_{1}}\ne {{l}_{2}}\]) Hence, \[\frac{{{m}_{1}}}{{{m}_{2}}}=\frac{{{l}_{1}}}{{{l}_{2}}}\] It means pole strength \[m\propto \frac{1}{l}\] So, the shorter magnet will have more pole strength.
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