Question regarding induced e.m.f

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Induced electromotive force (e.m.f) can occur in a circuit when it is switched on and off, as it is proportional to the rate of change of magnetic flux. However, the effectiveness of this method for inducing current is limited, often resulting in very small voltages, typically in the millivolt range. Rapid switching is necessary to generate a significant induced e.m.f, but practical limitations of the circuit components can hinder this. The discussion highlights that while induced e.m.f is possible, it may not be an efficient way to generate current. Understanding these principles clarifies why certain components, like LEDs, may only flash briefly in response to such switching.
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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 ^_^ .
 
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Hello, and welcome to PF!

Yes, you are right. For some circuits, the induced emf might be very small.
 
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 !
 
TSny said:
Hello, and welcome to PF!

Yes, you are right. For some circuits, the induced emf might be very small.
thank you :D
 
Noctisdark said:
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 !

Ah ! now i get it. why the L.E.D flashes once. Thanks
 
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