Lecture 30a

# Lecture 30a - Faradays law of Induction Electric guitar...

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Faraday’s law of Induction Wireless transmission of power Electric guitar

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Faraday’s Paradox A. If a steady current flows in the wire, the iron becomes a magnet B. If the iron is a magnet, a steady current is made to flow in the wire C. Both A and B are true D. Both A and B are false This is a coil of wire with a hunk of iron in it
Faraday’s experiments loop 1 loop 2 Change in magnetic field thru’ loop demos Current is induced in a conducting loop by:

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Magnetic Induction If the “amount” of magnetic field going through a conducting loop changes a current is induced in the loop. Induced current means there is induced emf (emf is Work done per unit charge to produce the current) We need a new quantity to describe the “amount” of magnetic field going through the loop: Magnetic Flux = B
Magnetic Flux thru’ a loop The loop is the border of a surface Divide the surface into area elements dA For each element compute dA B dA B B dA   loop ± = ± ∙ ?? = ±??²°³´ Open surface Units: Weber (Wb) If B is uniform, then = BAcos

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6 We have a square imaginary loop with side of length a. There is a Magnetic Field that is uniform throughout the region as shown.
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Lecture 30a - Faradays law of Induction Electric guitar...

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