1. Exam 2 Thursday, March 24 8 problems on the test
Problems will be taken from the 30 problems posted on the class schedule website
Values will be changed.
Same grading strategy as before
Take exam
Get grade for effort
Corrections with solutions
Regrade for correctness and need for correction
General Physics 2
Induction

2. More practice
What is the direction of the induced current in the circular loop due to the current in the wire?
General Physics 2
Induction

5. Electric Generators
General Physics 2
Induction

6. Plug & Chug
A simple generator is used to generate a peak output voltage of 24.0 V. The square armature consists of windings that are 6.0 cm on a side and rotates in a field of T at a rates of 60.0 rev/s. How many loops of wire should be wound on the square armature?
General Physics 2
Induction

7. Transformers t in primary induces VS in secondary coil
Works for AC only
DC voltages don’t have changing B field
General Physics 2
Induction

8. Transformers Step-Up Transformer Step-Down Transformer
Vs  VP
Step-Down Transformer
Vs  VP
Conservation of energy requires
PP = Ps
IP VP = IS VS
General Physics 2
Induction

9. Plug & Chug
A transformer has 320 turns in the primary coil and 120 in the secondary coil. What kind of transformer is this, and by what factor does it change the voltage? By what factor does it change the current?
General Physics 2
Induction

10. Self-Inductance changing current passes through a coil
produces changing B flux
which induces an emf
Induced emf opposes change in flux
inductance (H)
General Physics 2
Induction

11. Think-Pair-Share
If the current in a 180-mH coil changes steadily from 25.0 A to 10.0 A in 350 ms, what is the magnitude of the induced emf?
General Physics 2
Induction

14. The current in an LC circuit
The current in an LC circuit where the initial charge on the capacitor is Q0 is
The oscillation frequency is given by

15. Applications

16. More Practice Problems
Magnetism: Worksheets 5
Exploration in Physics
• In application folder
• Select E&M tab at the top
• Answer the questions under the Hints tab for
each of the following
• Lenz’s Law
• Cathode Ray Tube
• Trajectory in E and B fields
General Physics 2
Induction