The mutual inductance between a primary and secondary circuits is $0.5 \,H$. The resistances of the primary and the secondary circuits are $20\,\Omega$ and $5\,\Omega $ respectively. To generate a current of $0.4 \,A$ in the secondary, current in the primary must be changed at the rate of.....$A/s$

The mutual inductance of an induction coil is $5\,H$. In the primary coil, the current reduces from $5\,A$ to zero in ${10^{ - 3}}\,s$. What is the induced emf in the secondary coil......$V$

Two circular coils have their centres at the same point. The mutual inductance between them will be maximum when their axes

In a transformer, the coefficient of mutual inductance between the primary and the secondary coil is $0.2 \,henry$. When the current changes by $5$ $ampere/second$ in the primary, the induced $e.m.f$. in the secondary will be......$V$

Two coaxial coils are very close to each other and their mutual inductance is $5 \,mH$. If a current $50 sin 500 \,t$ is passed in one of the coils then the peak value of induced e.m.f in the secondary coil will be ........... $V$

Two circuits have coefficient of mutual induction of $0.09$ $henry$. Average $e.m.f$. induced in the secondary by a change of current from $0$ to $20$ $ampere$ in $0.006$ $second$ in the primary will be......$V$