SI Physics 222 Exam 2 Review – Tuesday November 1, 2011
1) An ideal LC circuit containing a 2.53 µH inductor oscillates at a frequency of 1 MHz. What is the capacitance of the capacitor in the circuit?
2) Consider the same circuit with a resistance of 10 Ohms. What is the new frequency, Inductance, and Capacitance?
3) An ideal LR series circuit contains a 5mH inductor and a 1000 Ohms resistor. At time t=0, the LR circuit is connected across a battery with a voltage of 23.7 V. At time t=5 µs, what is the current in the circuit?
4) In #3, the battery is removed, so the current in #3 is zero. Then A 10 Coulomb capacitor is charged with a 40 V battery and then placed in series with the inductor and resistor from #3.
What is the Root mean squared current through the circuit? What is the average power in the circuit?
5) U Phys: A converging lens has a focal length of 20cm. Find graphically the image location for an object at each of the following distances from the lens. A) 50cm B)20cm C)15cm D)-40cm
Determine the magnification in each case. Check your results by calculating the image position and lateral magnification. Is the image real or virtual?