Please help me solve this section d

Solution,
Solution
The solution/s to your query Q27 has been provided below:
Q27.
Given,
L = 50 mH
C = 80 $\mu$F
R = 40 $\Omega$
(i) Resonance occurs when X_L = X_C
$$\begin{gathered} \omega L=\frac{1}{\omega C} \\ {\omega }^2=\frac{1}{LC} \\ 4{\pi }^2{f}^2=\frac{1}{LC} \\ f=\sqrt{\frac{1}{4{\pi }^{2}LC}}=\sqrt{\frac{1}{4{\pi }^2\times 50\times {10}^{-3}\times 80\times {10}^{-6}}}=79.6 Hz \end{gathered}$$

(ii) The current in an AC circuit is said to be Wattless Current when the average power consumed in such circuit corresponds to Zero.

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