Question

The vector diagram of the current and voltage in a given circuit is shown in the figure. The components of the circuit will be

• A. $L-C-R$
• B. $L-R$
• C. $L-C-R\text{or}L-R$
• D. $C-R$

Answer 1

The correct option is C $L-C-R\text{or}L-R$


Clearly, from the diagram, voltage leads the current by ${45}^{\circ }$.

Voltage leads current in a circuit where nature is inductive.

In a purely inductive circuit, voltage leads the current by ${90}^{\circ }$.

But here, the phase difference between the voltage and current is $\left(\varphi \right)={45}^{\circ }$.

So, The circuit is either $R-L$ circuit or an $R-L-C$ circuit in which $X_L$ is dominant over $X_C$.

Hence, option $\left(\text{C}\right)$ is the correct answer.