<p>A resistance of 20<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#937;</mi></math>, a capacitance of 80<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#956;</mi><mi>F</mi></math>&nbsp;and an inductor of 50 mH are connectd in series. This combination is connected across a 220V a.c. supply of variable frequency. When the frequency of supply equals the natural frequency of the ciruit, calculate:</p>

<p>(a) angular frequency of supply, and</p>

<p>(b) impedance of the circuit.</p>