Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 100  102 of 121
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2098 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
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. 

