24 - Induction III

24 - Induction III - 1797-1878 Physics 212 Fall 2009...

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Physics 212 Fall 2009 Induction III Inductors 10/23/09 1797-1878
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Summary Faraday’s Law : A changing magnetic fux causes an EMF. Lenz’s Law: An induced current has a direction such that the magnetic ±eld due to the current opposes the change in the magnetic fux that induces the current ε = N d Φ B dt d Φ B dt = E d s Δ V = E d s
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Induced Current A triangular, aluminum loop is slowly moving to the right. Eventually, it will enter and pass through the uniform magnetic Feld region represented by the tails of arrows directed away from you. Initially, there is no current in the loop. When the loop is entering the magnetic Feld, what will be the direction of any induced current present in the loop? 1) clockwise 2) counterclockwise 3) no induced current
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Voltage and Current Wire #1 (length L) forms a one-turn loop, and a bar magnet is dropped through. Wire #2 (length 2L) forms a two-turn loop, and the same magnet is dropped through. Compare the magnitude of the induced currents in these two cases. 1) I 1 > I 2 2) I 1 < I 2 3) I 1 = I 2 0 4) I 1 = I 2 = 0 N S N S
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What is an Inductor? Inductor : Device that stores magnetic fux Ex. coil, solenoid,toroid Capacitor: Device that stores charge Stores energy in the electric Feld C = q V Inductors are used in circuits: oscillating components, electronic noise shielding, isolation trans±ormers,. ..
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This note was uploaded on 10/03/2011 for the course PHYS 212 taught by Professor Tedeschi during the Spring '08 term at South Carolina.

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24 - Induction III - 1797-1878 Physics 212 Fall 2009...

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