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Question

The magnetic field due to a short magnet a point on its axis at distance X cm from the middle point of the magnet is 200gauss. The magnetic field at a point on the neutral axis at a distance X cm from the middle of the magnet is

A
100gauss
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B
400gauss
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C
50gauss
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D
200gauss
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Solution

The correct option is A 100gauss
As we know that,
On the axis B=(2M/x3)
200=(2m/x3)
(M/x3)=100
∴ On the equator B=100Gauss.

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