A rectangular coil of a moving coil galvanometer has 50 turns and an area of `12cm^2`. It is suspended in a radial magnetic field of induction `0.025 Wb//m^2`. The torsional constant of the suspension fibre is `1.5 xx10^-9` Nm/degree. The current required to produce the deflection of `5^@` is
A
`5muA`
B
`2muA`
C
`4.5muA`
D
`5.5muA`
Text Solution
Verified by Experts
The correct Answer is:
A
`I=(K)/(n AB)theta= (1.5xx10^-9xx5)/(50xx12xx10^-4xx25xx10^-3)=5mu A ` .
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