Question 372: AC fundamentals

Question

In the given circuit, if $$\frac{\mathrm{dI}}{\mathrm{dt}}=-1 \mathrm{~A} / \mathrm{s}$$ then the value of $$\left(V_A-V_B\right)$$ at this instance will be

Accepted Answer

Applying KVL in the given circuit from point A to B,
$$\begin{array}{ll} 
& \mathrm{V}_{\mathrm{AB}}-\mathrm{IR}-\mathrm{L} \frac{\mathrm{dI}}{\mathrm{dt}}-12=0 \
& \mathrm{~V}_{\mathrm{AB}}-(2)(12)-6(-1)-12=0 \
& \mathrm{~V}_{\mathrm{AB}}=24+12-6 \
	herefore \quad & \mathrm{V}_{\mathrm{AB}}=30 \mathrm{~V}
\end{array}
$$

Answer

30 V

Answer

24 V

Answer

18 V

Answer

9 V

AC fundamentals

In the given circuit, if $\frac{\mathrm{dI}}{\mathrm{dt}}=-1 \mathrm{~A} / \mathrm{s} then the value of \left(V_A-V_B\right)$ at this instance will be

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