Assertion : A glowing bulb becomes dim when an iron bar is put in the inductor in the a.c. circuit
Reason : Resistance of the circuit increases.

In an A.C circuit having resistance and capacitance

Assertion : An electric bulb becomes dim, when an electric heater in parallel circuit is switched on. Reason : Dimness decreases after sometime.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : An electric bulb becomes dim, when the electric heater in parallel circuit is switched on. Reason : Dimness decreases after sometime.

In a simple A.C. circuit containing resistance, the current

Assertion : AC circuit derives maximum power when it is in a state of resonance. Reason: Power factor of the circuit becomes zero in case of reasonance.

Derive an expression for the impedance of an a.c. circuit consisting of an inductor and a resistor.