Inductors Practice Problems

A 260 mH inductor is connected to a circuit, as shown. The change in current in the circuit, di/dt = constant. A voltmeter connected across points p and q reads 2.02 V, q lying on at lower potential. Does the current in the circuit rise or fall?

The following measurements were obtained from a toroid during specification testing. An induced emf of magnitude 13.5 mV is observed when the current changes at a rate of 0.0322 A/s. In a different test, the mean flux per turn in the solenoid is 0.00372 Wb when the current in the solenoid is 2.60 A. Determine the total number of turns in the solenoid.

The diameter of a toroid is 22 cm. It has a cross-sectional area of 0.500 cm². Determine the number of turns required to make the inductance of the toroid 0.200 mH.