The magnetic poles placed in air repel each other with a force of 4×10−6N. When the space between them is filled with a medium the repulsive force becomes 2.24×10−5N. The relative permeability of the medium is
528
5.6
8.96×10−11
56
A
56
B
528
C
5.6
D
8.96×10−11
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Solution
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F=4×10−6N Fnew=2.24×10−5 F×M2=Fnew Here M is the permeability. M2=2.24×10−54×10−6 M2=5.6
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