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A bar magnet of length 3cm has points A ...

A bar magnet of length 3cm has points `A` and `B` along its axis at distance of `24cm` and `48cm` on the opposite sides. Ratio of magnetic field at these points will be

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The correct Answer is:
A
Magnetic field due to a bar magnet at a distance r from the centre of a magnet of axial position
`Rightarrow " " (B_(1))/(M_(2))=((r_(2))/(r_(1)))^(2)=((48)/(24))^(3)=(8)/(1)=8`
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