PHY 2049 Physics II n Tutoring Center is

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PHY 2049: Physics II n Tutoring Center is open in room NPB 1215, M-F

PHY 2049: Physics II n Tutoring Center is open in room NPB 1215, M-F 12: 00 AM -4: 00 PM. It is free.

Ch. 30 Induction and Inductance n n Magnetic Flux Faraday’s Law of Induction n

Ch. 30 Induction and Inductance n n Magnetic Flux Faraday’s Law of Induction n n Inductors n n n Lenz’ law Self and Mutual Series RL circuits Magnetic Energy

PHY 2049: Physics II

PHY 2049: Physics II

PHY 2049: Physics II When the switch is first thrown The inductors block any

PHY 2049: Physics II When the switch is first thrown The inductors block any current. All current flows through the middle resistance. I = V/R Later, the inductors are all closed and the current is then I = 3 V/R. How much time does it take for the current to rise?

On R-L circuits n n When the switch S in the circuit shown is

On R-L circuits n n When the switch S in the circuit shown is closed, the time constant for the growth of current in R 2 is: V = L d. I/dt +IR 2

4 3 2 1 hitt The four wire loops shown have edge lengths of

4 3 2 1 hitt The four wire loops shown have edge lengths of either L, 2 L, or 3 L. They will move with the same speed into a region of uniform magnetic field B, directed out of the page. Rank them according to the maximum magnitude of the induced emf, least to greatest. A. 1 and 2 tie, then 3 and 4 tie B. 3 and 4 tie, then 1 and 2 tie C. 4, 2, 3, 1 D. 1, then 2 and 3 tie, then 4 E. 1, 2, 3, 4 n

Electromagnetic Osciallations and Alternating Current n n Current changes expo in an R-L circuit

Electromagnetic Osciallations and Alternating Current n n Current changes expo in an R-L circuit Charge changes expo in an R-C circuit Sinusoidal in and L-C circuit Analogous to a harmonic Oscilaltor

The Potentials n n n Charge up a capacitor, plug in an inductor and

The Potentials n n n Charge up a capacitor, plug in an inductor and unplug battery. Pot across inductor oscillates. The potential across a capacitor oscillates.

Alternating Currents n A resistance

Alternating Currents n A resistance

Alternating Currents The current leads the voltage

Alternating Currents The current leads the voltage

Inductor n The current lags the voltage

Inductor n The current lags the voltage