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The distance between the poles of a horse shoe magnet is 0.1 m and its pole strength is 0.01 Am. The induction of magnetic field at a point midway between the poles will be
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a
2 x 10-5 T
b
4 x 10-6 T
c
8 x 10-7 T
d
Zero
answer is C.
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Detailed Solution
Net magnetic field at mid point P, B=BN+BSwhere BN = magnetic field due to N-poleBS= Magnetic field due to S-poleBN=BS=μ04πmr2=10-7 x 0.010.122=4 x 10-7 T∴Bnet=8 x 10-7 T
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