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.

2 B_{H}

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3 B_{H}

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B_{H}

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7 B_{H}

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Solution

The correct option is B $3 B_{H}$
The 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 $B_{H}$ (=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 = $2 B_{H} + B_{H} = 3 B_{H}$

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