SampleFA_Solutions

SampleFA_Solutions - 8.02 Sample Final A Solutions 1...

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8.02 Sample Final A Solutions p. 1/4 1. Concept Questions 1. A, B, F Magnetic charges don’t exist, but electric charges (either stationary or moving) and changing magnetic fields create electric fields 2. b You get multiple interference fringes before hitting a diffraction minima 3. a) A; b) A; c) Same a. Immediately after the switch S is closed the capacitor is uncharged and hence looks like a short circuit. So the current through B is 0 and the current through A is V/R. b. A very long time after the switch is closed the inductor looks like a short, so there is still no current through B and A still has a current of V/R passing through it. c. Immediately after the switch is reopened after having been closed for a very long time the current through A is clearly 0 because it is not in the loop. The current that is going through the inductor (V/R) cannot change, but since the capacitor is uncharged (it is in parallel with B which had no current through it and hence no voltage across it) it looks like a short and initially all of the current in L will run through C and there will still be no current in B. 4. d The Poynting vector shows the direction of energy flow. Since the capacitor is discharging, S points out of it. The energy is flowing into the resistor (which then dissipates it as heat).
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