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8.02 Sample Final A Solutions
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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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 Spring '07
 Hudson

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