Question 435: AC fundamentals

Question

A coil has inductance 2 H . The ratio of its reactance, when it is connected first to an $A C$ source and then to DC source, is

Accepted Answer

Given, inductance of a coil, $L=2 \mathrm{H}$
Reactance of coil, when it is connected to $A C$ source,
$$\begin{aligned}
& \left(X_Light)_{A C}=\frac{1}{\omega L} 	ext { where, } \omega=	ext { angular frequency } \
& \left(X_Light)_\omega=\frac{1}{2 \mu \omega}
\end{aligned}$$
For DC source, inductor coil behaves as pure conductor, hence $\left(X_Light)_{\mathrm{DC}}=0$
$$	herefore \quad \frac{\left(X_Light)_{A C}}{\left(X_Light)_{D C}}=\frac{\frac{1}{2 \omega}}{0}=\infty\quad	ext{(at infinity)}$$

Answer

zero

Answer

1

Answer

less than 1

Answer

infinity

AC fundamentals

A coil has inductance 2 H . The ratio of its reactance, when it is connected first to an A C source and then to DC source, is

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