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The needle of a deflection galvanometer ...

The needle of a deflection galvanometer shows a deflection of `60^(@)` due to a short bar magnet at a certain distance in tan A position. If the distance is doubled, the deflection is

A

`tan ^(-1) ((sqrt2)/(3))`

B

`tan ^(-1) ((sqrt3)/(8))`

C

`tan ^(-1) ((sqrt3)/(5))`

D

none of these

Text Solution

Verified by Experts

`B _(ext) = B_(H) tantheta and B _(ext) prop (1)/(r ^(3))therefore (8)/(1)=(tan 60^(@))/(tan theta ) implies theta = tan ^(-1) ((sqrt3)/(8))`
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