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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 amp-m. The induction of magnetic field at a point midway between the poles will be

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a

2×10−5T

b

4×10−6T

c

8×10−7T

d

Zero

answer is C.

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Detailed Solution

Net magnetic field at mid point P is B=BN+BS here, BN=BS=μo4πmr2=10−70.010.122=4×10−7T⇒B=4×10−7+4×10−7=8×10−7T

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