30. Induction and Inductance

A 30mH inductor carries a current of 500mA. If the circuit is opened and the current stops over a period of 3.0μs, what potential develops across the inductor?

In an $RL$ circuit with a resistor and an inductor in series connected to a constant voltage source, what effect does increasing the inductance of the inductor have on the rate at which the current reaches its maximum steady-state value after the circuit is closed?

A voltage $v\left(t\right)=10cos\left(2000\omega t\right)$ is applied to a $100-\mathrm{mH}$ inductor. What is the expression for the current $i\left(t\right)$ through the inductor (assume zero initial current)?

Which of the following expressions gives the energy stored in an ideal inductor with inductance $L$ carrying a current $I$?