Electromagnetic Induction & Alternating Currents (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 100  102 of 124
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Question number: 100
» Electromagnetic Induction & Alternating Currents » LCR Series Circuit
Question
An alternating emf of frequency is applied to a series LCR circuit. For this frequency of the applied emf is,
Choices
Choice (4)  Response  

a.  The circuit is at resonance and its impedance is made up only of a reactive part. 

b.  The current in the circuit is not in phase with the applied e. m. f. and the voltage across R equals this applied emf 

c.  The sum of the potential differences across the inductance and capacitance equals the applied e. m. f. which is 180° ahead of phase of the current in the circuit 

d.  The quality factor of the circuit is or and this is a measure of the voltage magnification (produced by the circuit at resonance) as well as the sharpness of resonance of the circuit. 

Question number: 101
» Electromagnetic Induction & Alternating Currents » Resonance
Question
The resonant frequency of a circuit is f. If the capacitance is made 4 times the initial values, then the resonance frequency will become
Choices
Choice (4)  Response  

a. 


b.  f 

c.  174 

d.  Both a. and c. are correct 

Question number: 102
» Electromagnetic Induction & Alternating Currents » Power in AC Circuits
Question
If a current I given by flows in an ac circuit across which an ac potential of has been applied, then the average power consumption P in the circuit will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

