Faraday’s Law. Faraday’s Law of Induction.
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• The magnitude of B can change with time.
• The area enclosed by the loop can change with time.
The angle θ between B and the normal to the loop can change with time.
• Any combination of the above can occur.
(a) In an electric guitar, a vibrating magnetized string induces an emf in apickup coil. (b) The pickups (the circles beneath the metallic strings) of this electricguitar detect the vibrations of the strings and send this information through an
amplifier and into speakers. (A switch on the guitar allows the musician to select whichset of six pickups is used.)
conductor moving through a constant magnetic field.
a potential difference is maintained between the ends
of the conductor as long as the conductor continues to move through the
uniform magnetic field. If the direction of the motion is reversed, the polarity of thepotential difference is also reversed
through the area enclosed by the
loop increases in time. By Lenz’s
law, the induced current must be
counterclockwise so as toproduce a counteracting magntic field directed out of the page. (b) Whenthe bar moves to the left, the
induced current must be clockwise.