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The magnetic induction at a point on the...

The magnetic induction at a point on the equator, at a distance of 15 cm from the centre of a short bar magnet is `1.2 xx10^(-5)" Wb/m"^(2)`. What is the magnetic induction at a point on the axis at the same distance from the centre?

A

`1.8xx10^(-5)" Wb/m"^(2)`

B

`2.4xx10^(-5)" Wb/m"^(2)`

C

`3.2xx10^(-5)" Wb/m"^(2)`

D

`0.6xx10^(-5)" Wb/m"^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
For a short magnet, if we take two points at the same distance along the axis and the equator, then
`B_("axis")=2` (magnetic induction on the equator)
`:. B_("axis")=2xx1.2xx10^(-5)=2.4xx10^(-5)" Wb/m"^(2)`
It is directed along SN.
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