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Induced EMF: Observations<br />
Faraday’s observations:<br />
• Relative motion induces emf.<br />
B<br />
Flux lines F in Wb<br />
• Direction of emf depends on<br />
direction of motion.<br />
• Emf is proportional to rate at<br />
which lines are cut (v).<br />
• Emf is proportional to the<br />
number of turns N.<br />
N turns; velocityv<br />
Faraday’s Law:<br />
E=<br />
F<br />
-N<br />
t<br />
The negative sign means that E opposes its cause.
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