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 f
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`
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Correct Answer - 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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