Lecture16_Kim

# Lecture16_Kim - Lecture 16-1 Physics 241 Question 1 Four...

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Lecture 16-1 Physics 241 –Question 1 – October 20, 2011 Four long straight wires, each carrying a current I are perpendicular to the plane of this drawing, and form a square. What is the direction of the net magnetic force on the top-left wire? a) To the upper right b) To the lower left c) To the upper left d) To the lower right e) No net magnetic force

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Lecture 16-2 2 Faraday’s Experiments (1) When we move the north pole of the magnet toward the wire loop, we induce a positive current in the loop When we move the south pole of the magnet toward the loop, we induce a negative current in the loop
Lecture 16-3 3 Faraday’s Experiments (2) Now let’s point the north pole toward the loop but move away from the loop – We get a negative current We turn the magnet around so that the south pole points toward the loop and move away from the loop – We get a positive current

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Lecture 16-4 4 Faraday’s Experiments (3) We can create similar effects by placing a second loop near the first loop If a constant current is flowing through loop 1, no current will be induced in loop 2 If we increase the current inloop 1, we observe that a current is induced inloop 2 in the opposite direction
Lecture 16-5 5 Faraday’s Experiments (4) Now if we have the current flowing in loop 1 in the same direction as before, and decrease the current as indicated below, we induce a current in loop 2, in the same direction as the current in loop 1

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## This note was uploaded on 12/07/2011 for the course PHYS 241 taught by Professor Wei during the Fall '08 term at Purdue.

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Lecture16_Kim - Lecture 16-1 Physics 241 Question 1 Four...

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