Answers to practice exam #2
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       1) 0.25 microohm
       2) lamps 1 and 2 get brighter; lamp 3 turns off
       3) equal to; smaller than; smaller than
       4) greater than; equal to; greater than
       5) 90 W
       6) 0.056 W
       7) none of the above
       8) the charge is negative and slowing down
       9) is always smaller than the small resistor
      10) 1.0 mm

      Partial Credit
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      p7) I10=1A left; I20=1.5A up; I8=2.5A down

      p8) 0.1 ohm; 1.0204 watts; 1.438 volts

      p9) 0.8 sec; 2 mA; 0 A; 800 microcoulombs