A loop of wire has a potential difference of 1.2 V across it. The loop has a self-inductance of 125 mH. How much time is required for the loop to increase the current through it by 0.25 A?
A transformer with an iron core has a primary coil that has 15 turns and a secondary coil that has also 15 turns. In a time of 0.25 s, a potential difference of 12 V is applied across the primary coil, inducing a potential difference of 12 V across the secondary coil. What is the change of the magnetic flux through the iron core?
A transformer with an iron core has a primary coil that has 75 turns and a secondary coil that has also 75 turns. The coils have a mutual inductance of 15 H. The current in the primary coil increases the current in the secondary coil at a rate of 1.25 A/s. What is the potential difference across the coils?