# Magnetic field, alternated current and EMF

If I apply an alternated current to a solenoid and insert into it a smaller solenoid, I could measure the induced EMF (electromotive force) and study how it changes in relation to the frequency of signal generator.

If I increase the frequency, I think that the magnetic fiel increases and so also the EMF increases, isn't it?

If I insert a metallic cylinder between the two solenoids, the cyclinder "shields" the magnetic field.. but what about EMF? And what about EMF if the cylinder is made by iron?

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your question shows you dont have understanding of basic concepts including that of magnetic field and emf. so i would suggest you try to understand these first before trying to pose more detailed questions. –  guru Jul 1 '13 at 18:16
@guru I'd like to know where you can see that I haven't understood the basic concepts of magnetic field and emf. –  sunrise Jul 1 '13 at 19:13
"If I insert a metallic cylinder between the two solenoids, the cyclinder "shields" the magnetic field.. but what about EMF? And what about EMF if the cylinder is made by iron?" do you know how emf is connected to change of magnetic field, for eg.? if you did, would you feel the need to ask this question? –  guru Jul 2 '13 at 4:06