Summary

• Induced electric fields
• Self-inductance
• Inductors

• Sneak peek of final exam Kirchhoff's laws question



• Energy & inductance



• Magnetic energy density
Example #1





• LC circuits
• animated applet
• Compare with mechanical oscillator applet
Example #2
Example #3

POP5 23.48
How much energy is stored in a superconducting solenoid of diameter 6.20 cm and length 26.0 cm when it produces a 4.50 T magnetic field?
A. 8.06 MJ
B. 522 kJ
C. 6.32 kJ
D. 1.77 J
Answer















POP5 24.4
A fixed inductance L = 1.05 µH in an LC circuit is connected in series with a variable capacitor to tune to a 6.30 MHz broadcast. What is C?
A. 608 pF
B. 1.18 nF
C. 38.5 nF
D. 6.55 µF
Answer



















klm
At time t = 0 the switch is closed in the circuit below when the capacitor is fully charged. If C = 15.0µF and L = 15.0 mH, what is the first time the capacitor will be fully discharged?
A. 328 ms
B. 633 ns
C. 745 µs
D. Never!
Answer



























 



C. 6.32 kJ






















 



A. 608 pF






















 
C. 745 µs




































There is another animated version of the figure below: