Unformatted text preview: duced only when flux is changing.
Flux is changing because loop is moving.
As loop enters field, current will be induced to reduce the increase in flux (Lenz’ law): counterclockwise current generates B field pointing out of the page.
When loop is completely inside field, flux is constant, therefore, current is zero
As loop leaves field current will be induced to produce B field pointing into the page.
Physics 212 Lecture 29, Slide 11 Faraday’s Law Two fixed conductors are connected by a resistor R = 20 Ohms. The two fixed conductors are
separated by L = 2.5 m and lie horizontally. A moving conductor of mass m slides on them at a
constant speed, v, producing a current of 3.75 A. A magnetic field with magnitude 5 T points out of
the page. In which direction does the current flow through the moving conductor when the bar is
sliding in the direction shown?
A. to the right B. to the left R = 20 Ohms
20 H Flux is changing because area of the loop is changing.
As the moving conductor slides downward the area and therefore the flux increases.
Therefore a current must flow in the clockwise direction to generate a magnetic field pointing into the page v = 6 m/s L
Physics 212 Lecture 29, Slide 12 Faraday’s Law Two fixed conductors are connected by a resistor R = 20 Ohms. The two fixed conductors are
separated by L = 2.5 m and lie horizontally. A moving conductor of mass m slides on them at a
constant speed, v, producing a current of 3.75 A. A magnetic field with magnitude 5 T points out of
the page.
At what speed is the conductor moving?
A. 1 m/s B. 3 m/s R = 20 Ohms
20...
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 Fall '08
 Kim
 Physics, Electrostatics, Electric charge

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