Question

An emf of 50mv is induced in a coil when the current in the neighbouring coil changes from 10A to 5A in 0.1s. What is the mutual inductance of the coils?

Answer 1

$$\begin{gathered} Inducedemfinthesecondcoilduetochangeincurrentinfirstcoilisgivenby: \\ e=M\frac{di}{dt} \\ WhereMisthemutualinduc\tan cebetweenthetwocoils. \\ 50\times {10}^{-3}=M\frac{10-5}{0.1} \\ M=\frac{50\times {10}^{-3}\times 0.1}{5} \\ M=0.001H \end{gathered}$$