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Question

A bar magnet is placed with its north pole pointing towards north. The neutral point is at a distance 20cm from the center of the magnet. The net magnetic induction at a distance 10cm on the axial line of the magnet is:


A
3BH
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B
7BH
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C
15BH
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D
17BH
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Solution

The correct option is B 7BH
BH=2μ0M4πd3 (At Nullpoint) d=20m
BH=2μ0M4π(20)3
as B1d3
B20cmB10cm=103203
B10cm=8B20cm=8BH
At 10cm from the magnet,
B=BmagnetBH
=8BHBH
=7BH

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