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The magnetic needle of a tangent galvano...

The magnetic needle of a tangent galvanometer is defiected at an angle deg60 due to a magnet. The horizontal component of earth's magnetic field 0.34 10T is along the plane of the coll The magnetic field of coil is

A

`1.96 xx 10^(-4)T`

B

`1.96xx10^(4)T`

C

`1.96 xx 10^(-5)T `

D

`1.96 xx 10^(5)T`

Text Solution

Verified by Experts

The correct Answer is:
C
Angle through which magnet is deflected `(theta)= 30^(@)` and horizontal magnetic field `(B_(R))=0.34xx 10^(-4)T` . Magnetic intensity `=B_(R) tan theta = 0.34 xx 10^(-4) xx tan 30^(@) =(0.34 xx 10^(-4)) xx 0.577 =1.96 xx 10^(-5) T `.
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