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
B
400gauss
C
50gauss
D
200gauss

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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