Question

# A bar magnet is placed with its North pole pointing North. Neutral point is at a distance ‘d’ from the center of magnet. The net magnetic induction at the same distance on the axial line of the magnet.

A
2BH
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B
3BH
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C
BH
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D
7BH
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Solution

## The correct option is B 3BHThe magnetic field due to a bar magnet at an axial point is double in magnitude than that at an equatorial point. The magnetic field at distance d due to the bar magnet at the equator is equal to BH (=earth's magnetic field) since it's a neutral point. At an axial point, the earth's field and the bar's field will point in the same direction and hence add up. Hence, net field = 2BH+BH=3BH

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