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A tangent galvanometer has a coil of 25 ...

A tangent galvanometer has a coil of 25 turns and radius of 15 cm. The horizontal component of the earth's magnetic field is `3xx10^(-5)T`. The current required to producea defection of `45^(@)` in it, is

A

`0.29A`

B

`1.2A`

C

`3.6xx10^(-5)A`

D

`0.14A`

Text Solution

Verified by Experts

The correct Answer is:
A
`i=(2rB_(H))/(mu_(0)N) tan theta`
`implies i=(2xx15xx10^(-2)xx3xx10^(-5))/(4pixx10^(-7)xx25)xxtan 45^(@) impliesi=0.29`
`implies i=0.29 A`
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