Question

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

• A. $5\times {10}^{-4}rad/\mu amp$
  
• B. $5\times {10}^{-6}peramp$
  
• C. $5\times {10}^{-7}peramp$
  
• D. $5rad/\mu amp$
  
  

Answer 1

The correct option is D $5rad/\mu amp$



Current sensitivity $\left(S_i\right)=\frac{\theta }{i}=\frac{NBA}{C}\Rightarrow \frac{\theta }{i}=\frac{100\times 5\times {10}^{-4}}{{10}^{-8}}=5rad/\mu amp$.