An $e.m.f.$ of $100$ $millivolts$ is induced in a coil when the current in another nearby coil becomes $10$ $ampere$ from zero in $0.1$ $second.$ The coefficient of mutual induction between the two coils will be....$millihenry$
$1$
$10 $
$100$
$1000$
Find the mutual inductance in the arrangement, when a small circular loop of wire of radius ' $R$ ' is placed inside a large square loop of wire of side $L$ $( L \gg R )$. The loops are coplanar and their centres coincide :
The pointer of a dead-beat galvanometer gives a steady deflection because
In $SI$, Henry is the unit of
Derive formula for mutual inductance for two very long coaxial solenoids. Also discuss reciprocity theorem.
Explain mutual induction and derive equation of mutual $\mathrm{emf}$.