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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

A

3

B

8

C

`(1)/(2) sqrt(2)`

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
8
Explanation : `B=(mu_(0))/(4pi)(2M)/(r^(2))`
`(B_(1))/(B_(2))=((r_(2))/(r_(1)))^(3)=(8)/(1)=8`
Magnetic field lines are closed which starts in air from N-pole and end in S-Pole. The field lines return North pole through interior of the magnet:
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