Question

In an electric circuit, a resistance $(30\Omega )$, a capacitance (impedance $40\Omega$ ) and an inductance (impedance $80\Omega )$, are all connected in series to a $180$ volt, $50$ hertz source. The total impedance of the circuit is

• A. $30\Omega$
• B. $50\Omega$
• C. $70\Omega$
• D. $90\Omega$

Answer 1

Answer: (B)

$2=\sqrt{(30{)}^2+(80-40{)}^2}$
$=50$