The coefficient of mutual inductance between the primary and the secondary coil of a transformer is \(0.2…
The coefficient of mutual inductance between the primary and the secondary coil of a transformer is \(0.2 \mathrm{H}\). When the current in the primary changes by \(5 \mathrm{As}^{-1}\), then the induced emf in the secondary will be
\(5 \mathrm{~V}\)
\(1 \mathrm{~V}\)
\(25 \mathrm{~V}\)
\(10 \mathrm{~V}\)
Solution
Given, coefficient of mutual induction,
\(M=0.2 \mathrm{H}\)
The rate of change in current in primary coil.
\(\frac{d I}{d t}=5 \mathrm{As}^{-1}\)
\(\therefore\) Induced emf in the secondary coil,
\(e=M \frac{d I}{d t}=0.2 \times 5=1 \mathrm{~V}\)