1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    User Avatar
    Homework Helper
    Gold Member
    2017 Award

    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted