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Question regarding induced e.m.f

  1. May 20, 2015 #1
    can we still induced e.m.f in a circuit if we switch on and off the circuit. Well, since induced e.m.f is proportional to the rate of change of magnetic flux. I guess alternating the switches can changes the magnetic flux of a circuit. Please correct me if i'm wrong ^_^ .
     
  2. jcsd
  3. May 20, 2015 #2

    TSny

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    Hello, and welcome to PF!

    Yes, you are right. For some circuits, the induced emf might be very small.
     
  4. May 20, 2015 #3
    You can, but a poor way of inducing current, you can't switch very fast and the coil in your circuit won't make it so perfect, you end up with few milli volts !
     
  5. May 20, 2015 #4
    thank you :D
     
  6. May 20, 2015 #5
    Ah ! now i get it. why the L.E.D flashes once. Thanks
     
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