SOLUTION

Linear circuit: The circuit whose parameters are constant, that is, they do not change with the application of voltage or current is called a linear circuit.

If the resistance, inductance or capacitance offered by an element does change linearly with the change in applied voltage or circuit current, the element is termed as linear element. The voltage-current characteristics is a straight line through the origin. Such an element shows a linear relation between voltage and current as shown in Fig.

Ordinary resistors, capacitors and inductors are examples of linear elements.