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A tangent galvanometer carrying a certai...

A tangent galvanometer carrying a certain current gave a defelction of `30^(@)`. If the galvanometer is taken to another location where the earth's horizontal component of magnetic induction is one thrid of the previous value, The deflection for the same current will be

A

`60^@`

B

`45^@`

C

`90^@`

D

`30^@`

Text Solution

Verified by Experts

The correct Answer is:
A
If K is the reduction factor of the galvanometer then `K = (2r B_H)/(mu_0 n) ` . As `B_H` is reduced to `1//3^(rd)` , K beccome K/3 . Use `I = K tan theta `
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