Q1PhysicsUnit 14: Electromagnetic Induction and Alternating Currents
Ratio of impedance to capacitive
reactance has
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Easy Reactance and impedance, LCR series circuit, resonance, power in AC circuits, wattless current MCQs for JEE
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Syllabus context
Part of Electromagnetic Induction and Alternating Currents in JEE Main Physics.
- Electromagnetic induction: Faraday's law, induced emf and current, Lenz's law, eddy currents, self and mutual inductance
- Alternating currents, peak and RMS value of alternating current/voltage
- Reactance and impedance, LCR series circuit, resonance, power in AC circuits, wattless current
- AC generator and transformer
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Q2PhysicsUnit 14: Electromagnetic Induction and Alternating Currents
The power loss in an circuit is
when in the circuit there is only
Q3PhysicsUnit 14: Electromagnetic Induction and Alternating Currents
Assertion
In series circuit, current
and voltage are in same phase at
resonance.
Reason
In series circuit,
resonant frequency does not depend on the value of resistance. Hence current,
at resonance, does not depend on
resistance.
Q4PhysicsUnit 14: Electromagnetic Induction and Alternating Currents
The current flowing through the resistor
in a series LCR a.c. circuit, is
Now the inductor and capacitor are
connected in parallel and joined in series with the resistor as shown in
figure. The current in the circuit is now.
(Symbols have their usual meaning)
Q5PhysicsUnit 14: Electromagnetic Induction and Alternating Currents
In series LCR circuit and
impedance is . An r.m.s. voltage
is applied across the circuit. The true power consumed in a.c. circuit is
Q6PhysicsUnit 14: Electromagnetic Induction and Alternating Currents
For filtering low frequency noise out of a signal the circuit can be built by just putting resistor and capacitor in
Q7PhysicsUnit 14: Electromagnetic Induction and Alternating Currents
If we change the value of , then
Q8PhysicsUnit 14: Electromagnetic Induction and Alternating Currents
The inductive reactance of a choke coil
of in an circuit of will be
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Popular questions in Reactance and impedance, LCR series circuit, resonance, power in AC circuits, wattless current
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