
The current in an - circuit builds upto of its steady state value in . The time constant of this circuit is


Important Questions on Electromagnetic Induction
Some magnetic flux is changed from a coil of resistance . As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in is

The current in an induction coil varies with time according to the graph shown
in figure. Which of the following graphs shows the induced in the coil with time?

Switch of the circuit shown in figure is closed at . If denotes the induced in and , the current flowing through the circuit at time , which of the following graphs is correct?




A capacitor of capacity is charged to a potential difference of . It is then connected across an inductor of inductance . The current in the circuit at a time, when the potential difference across the capacitor is

In the circuit shown, the coil has inductance and resistance. When is joined to , the time constant is during growth of current. When the steady state is reached, heat is produced in the coil at a rate . is now joined to ,
