As the frequency of an AC circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?
(4) Hint: The current in the circuit depends on the impedance.
Step 1: The reactance of an inductor of inductance L is,
where v is the frequency of the AC circuit.
= Reactance of the capacitive circuit
Step 2: On increasing frequency v, clearly increases and decreases.
For circuit,
Z = impedance of the circuit
Step 3: As frequency (f) increases, Z decreases and at certain value of frequency known as resonant frequency , impedance Z is minimum that is , the current varies inversely with impedance and at current is maximum.
