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A short magnet of magnetic induction fie...

A short magnet of magnetic induction fields `B_(1),B_(2),B_(3)` values on this line at points which are at distance 30cm, 60cm and 90cm respectivley from the centre of the magnet is

A

`27:3:37:1`

B

`37.3:1:27`

C

`27:8:3.37`

D

`1:2:3`

Text Solution

Verified by Experts

The correct Answer is:
A
We know that the magnetic field induciton at a point,
`" " B=mu_(0)/(4pi)(M)/(r^(3))`
According to question `B_(1):B_(2):B_(3)=(1)/(0.3)^(3):(1)/(0.6)^(3):(1)/(0.9)^(3)`
27:3:37:1
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