The magnetic needle of a tangent galvano...

The magnetic needle of a tangent galvanometer is deflected at an angle of `30^@` due to magnet. The horizontal component of earth's magnetic field `0*34xx10^-4T` is along the plane of the coil. What is magnetic intensity?

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Verified by Experts

The correct Answer is:

`1*96xx10^-5T`

Here, `theta=30^@`, `H=0*34xx10^-4T`, `B=?`
`B=H tan theta=0*34xx10^-4tan30^@`
`=(0*34)/(sqrt3)xx10^-4=1*96xx10^-5T`

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