Question 366: AC fundamentals

Question

With increase in frequency of a.c. supply, the impedance of an L-C-R series circuit

Accepted Answer

We know
$$\mathrm{X}_{\mathrm{L}}=\mathrm{L} \omega 	ext { and } \mathrm{X}_{\mathrm{C}}=\frac{1}{\mathrm{C} \omega}$$
$$\Rightarrow$$ When the frequency increases, $$X_L$$ increases and $$X_C$$ decreases.
$$	herefore \quad$$ The impedance of an LCR series circuit decreases at first, becomes minimum and then increases.

Answer

remains constant.

Answer

increases.

Answer

decreases.

Answer

decreases at first, becomes minimum and then increases.

AC fundamentals

With increase in frequency of a.c. supply, the impedance of an L-C-R series circuit

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