Electromagnetic Induction & Alternating CurrentsReactance and Impedance [NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics]: Questions 6  10 of 14
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Question number: 6
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
A 20 volt ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is
Choices
Choice (4)  Response  

a.  16 volt  
b.  10 volt  
c.  6 volt  
d.  8 volt 
Question number: 7
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
One 10 V, 60 W bulb is to be connected to 100 V line. The required induction coil has selfinductance of value (f = 50Hz)
Choices
Choice (4)  Response  

a.  16.2 mH  
b.  1.62 mH  
c.  2.42 H  
d.  0.052 H 
Question number: 8
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
A resistance of 300 Ω and an inductance of 1/π henry are connected in series to a ac voltage of 20 volt and 200 Hz frequency. The phase angle between the voltage and current is,
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 9
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
Energy stored in an inductor is proportional to (i= current in the inductor)
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 10
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
An inductor (L = 100 mH), a resistor (R = 100Ω) and a battery (E = 100 V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit 1 ms after the short circuit is
Choices
Choice (4)  Response  

a.  0.1 A  
b. 
 
c.  e A  
d.  1 A 