- #1

yungman

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[tex]EMF=-\frac{\partial \Phi}{\partial t}[/tex]

If two identical coil with same turns of wire and same dimension ( same cross section area in the middle), one has only air and the other has a magnet core. If the two placed in an uniform varying magnetic field, is there any difference in the induced EMF?

From my understanding, induced EMF is independent to the core material because the amplitude of the external field

**B**is constant so is the area in the middle is constant.

[tex] \Phi=|\vec B|S\;\hbox { if }\; \vec B \;\hbox { is parallel to }\;\vec S [/tex]