Electromagnetic Induction & Alternating CurrentsReactance and Impedance (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 1  5 of 14
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Question number: 1
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
A 120 Volt ac source is connected across a pure inductor of inductance 0.70 H. If the frequency of the ac source is 60 Hz, the current passing through the inductor is
Choices
Choice (4)  Response  

a.  4.55 amp  
b.  0.455 amp  
c.  3.55 amp  
d.  0.355 amp 
Question number: 2
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
In an L  R circuit, the value of L is henry and the value of R is 30 ohm. If in the circuit, an alternating e. m. f. of 200 volt at 50 cycles per sec is connected, the impedance of the circuit and current will be
Choices
Choice (4)  Response  

a.  40.4 Ω, 5A  
b.  30.7 Ω, 6.5A  
c.  50 Ω, 4A  
d.  11.4Ω, 17.5A 
Question number: 3
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
In the circuit, E = 10 volt, R1 = 5.0 ohm, R _{2} = 10 ohm and L = 5.0 henry. The current just after the switch S is pressed is.
Choices
Choice (4)  Response  

a.  2.0A  
b.  6.0A  
c.  5.0A  
d.  3.0A 
Question number: 4
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
An alternating current of frequency is flowing in a circuit containing a resistor of resistance R and a choke of inductance L in series. The impedance of this circuit is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 5
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
An inductive circuit contains resistance of 10Ω and an inductance of 20 H. If an ac voltage of 120 V and frequency 60 Hz is applied to this circuit, the current would be nearly
Choices
Choice (4)  Response  

a.  0.48 A  
b.  0.32 A  
c.  0.80 A  
d.  0.016 A 