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

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a
100 gauss
b
400 gauss
c
50 gauss
d
200 gauss

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detailed solution

Correct option is A

Along the axis of magnet, Ba=μ04π2MX3=200 gauss⇒Be=μ04πMX3=100 gauss

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