Question

The coil of a galvanometer consists of 100 turns and effective area $1c{m}^2$ . The restoring couple is ${10}^{-8}N-m/rad$ . The magnetic field between the pole pieces is 5 Tesla. The current sensitivity of the galvanometer will be:

• A. $5\times {10}^4$ radian per micro ampere
• B. $5\times {10}^6$ radian per micro ampere
• C. $2\times {10}^{-7}$ radian per micro ampere
• D. 5 radian per micro ampere

Answer 1

Answer: (D)

5 radian per micro ampere

$X_i=\left(\frac{\varphi }{I}\right)=\frac{NBA}{C}$
=$\frac{100\times {10}^{-4}\times 5}{{10}^{-8}}$
=5 radian per micro ampere