Concept #1: Self Inductance

Practice: A single loop of wire with a current of 0.3A produces a flux of 0.005 Wb. If the self-induced EMF on this loop is 10 mV, how quickly must the current be changing?

Example #1: Self-Inductance of a Toroid

A long straight solenoid has 800 turns. When the current in the solenoid is increasing at a constant rate of +0.20 A/s the emf induced in the coil is 0.060 V. What is the self-inductance of the solenoid?

A long straight solenoid has 800 turns. When the current in the solenoid is increasing at a constant rate of +0.20 A/s the emf induced in the coil is 0.060 V. When the current in the solenoid is 15.0 A, what is the average magnetic flux through each turn of the solenoid?

At an instant when the current through an inductor is I = 4.0 A and the current through the inductor is increasing at a rate of Δi/Δt = +0.50 A/s, the voltage across the inductor is 8.0 V. The resistance of the inductor is negligible. What is the self-inductance of the inductor?
(a) 2.0 H
(b) 32.0 H
(c) 16.0 H
(d) 8.0 H
(e) 4.0 H
(f) none of these answers