QUIZ 5 Thursday 21 September
Bonus points
2 points for correct answer
1 point for wrong answer and
1. Suppose you have three identical lightbulbs, some wire, and a battery. You connect
one lightbulb to the battery and take note of its brightness. You add a second lightbulb,
connecting it in parallel with the previous bulbs, again taking note of the brightness.
Repeat the process with the third bulb. As the lightbulbs are added, what happens to (the
brightness of the bulbs? ( (Neglect the battery’s internal resistance)
(a) unchanged
(b) increases
(c) decreases
Answer: (a)
2. If the lightbulbs in question 1 are connected in series instead of in parallel, what
happens to the brightness of the bulbs? (Again, neglect the battery’s internal resistance)
(a) unchanged
(b) increases
(c) decreases
Answer: (c)
3. The switch is closed in the figure . After a long time compared to the time constant of
the capacitor, what will the current be in the 2-Ω resistor?
(a) 4 A
(b) 3 A
(c) 2 A
(d) 1 A
(e) more information is needed
Answer: (c)