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The magnetic needle of a tangent galvano...

The magnetic needle of a tangent galvanometer is deflected at an angle `30^(@)` due to a magnet. The hoeizontal component of earth's magnetic field `0.34xx10^(-4)T` is along the plane of the coil. The magnetic intensity is

A

`1.96xx10^(-4)T`

B

`1.96xx10^(-5)T`

C

`1.96xx10^(-4)T`

D

`1.96xx10^(5)T`

Text Solution

Verified by Experts

The correct Answer is:
b
(b) We know that
`(B)/(B_(H))=tan theta "or" B=B_(H) tan theta=0.34xx10^(-4)tan 30^(@)`
`=1.96xx10^(-5)T`
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