<p>A circuit containg a 20<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#937;</mi></math>&nbsp;resistor and 0.1<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#956;</mi></math>F capacitor in series is connected to 230V a.c. supply of angular frequency 100 rad&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>s</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. What is the impedance of the circuit?</p>