Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 81  85 of 124
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Question number: 81
» Electromagnetic Induction & Alternating Currents » Induced EMF and Current
Assertion (Ꭺ)
The induced e. m. f. and current will be same in two identical loops of copper and aluminum, when rotated with same speed in the same magnetic field.
Reason (Ꭱ)
Induced e. m. f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

b.  Ꭺ is true but Ꭱ is false 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Ꭺ is false but Ꭱ is true 

Question number: 82
» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer
Question
A current of 5A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200V and 50 % of power is lost, then the current in the secondary coil will be 
Choices
Choice (4)  Response  

a.  0.25A 

b.  0.025A 

c.  5A 

d.  2.5A 

Question number: 83
» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC
Question
An alternating current is given by the equation . The r. m. s. current is given by
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 84
» Electromagnetic Induction & Alternating Currents » Induced EMF and Current
Question
A current increases uniformly from zero to one ampere in 0.01 second, in a coil of inductance 10 mH. The induced e. m. f. will be –
Choices
Choice (4)  Response  

a.  3 V 

b.  4V 

c.  1 V 

d.  2 V 

Question number: 85
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
An alternating voltage is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is
Choices
Choice (4)  Response  

a.  500 V 

b.  350 V 

c.  250 V 

d.  300 V 
