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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 $$200 gauss$$. 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 $$100 gauss$$
As we know that,
On the axis $$B = (2M/x^3)$$
∴  $$200 = (2m/x^3)$$ 
∴  $$(M/x^3) = 100$$
∴  On the equator $$B = 100 Gauss$$.

Physics

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