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A short bar magnet with its nroth pole ...

A short bar magnet with its nroth pole facing north forms a neutral point at p in the horizontal plane if the magmnet is rotated by `90^(@)` the net magnetic inductino at P is

A

0

B

`2B_(H)`

C

`sqrt(5)/(2)B_(H)`

D

`sqrt(5)B_(H)`

Text Solution

Verified by Experts

The correct Answer is:
D
Intitally

neutral point obtained on equatorial line and at neutral point `B_(H)=B_(e )`
where `B_(H)`=Horizontal componetn of earth magnetic field `B_(e )`=Magnetic field to bar magnet on it equation line
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