Question

In the adjoining figure the impedance of the circuit will be

• A. 120 ohm
• B. 50 ohm
• C. 60 ohm
• D. 45 ohm

Answer 1

The correct option is D 45 ohm

$i_L=\frac{90}{30}=3A,$ $i_c=\frac{90}{90}=1A$

Net current through circuit $i=i_c-i_L=2A$

$\therefore Z=\frac{V}{i}=\frac{90}{2}=45\Omega$