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When a bar magnet is placed at some dist...

When a bar magnet is placed at some distance along the axis of the magnetic needle of an oscillation magnetometer located in earth's magnetic field, the needle makes `14` oscillaitons per minute. If the bar magnet is turned so that its poles exchange their positions, the needle makes `20` oscillations per minute. If the magnet is completely removed, the frequency of the needle is nearly `("assuming"BgtB_(H)` "at needle")`

A

`20 "oscillations"//"minute"`

B

`15 "oscillations"//"minute"`

C

`5"oscillations//minute"`

D

`10 "oscillatons"//"minute"`

Text Solution

Verified by Experts

The correct Answer is:
D
`n_(1)^(2)=K(B-B_(H))`
`n_(2)^(2)=K(B+B_(H))`
`n_(3)^(2)=KB_(H)`
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