Inductors in DC Circuits

2025 1 question

1. AB is a part of an electrical circuit with elements from A to B: inductor ($L = 1\text{ H}$), DC battery of $5\text{ V}$ with positive terminal towards A, and resistor ($R = 2\,\Omega$). The potential difference $V_A - V_B$ at the instant when current $i = 2\text{ A}$ is directed from A to B and is increasing at a rate of $1\text{ amp/second}$ is: