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As per the given figure, if $$\frac{dI}{dt} = -1$$ A s$$^{-1}$$, then the value of $$V_{AB}$$ at this instant will be ______ V.
Correct Answer: 30
$$V_A - I \cdot R - L \frac{dI}{dt} - E = V_B$$
$$V_A - V_B = I \cdot R + L \frac{dI}{dt} + E$$
$$V_{AB} = (2 \cdot 12) + (6 \cdot -1) + 12$$
$$V_{AB} = 30\ \text{V}$$
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