9. In the circuit shown, the switch is open at first, so the nichrome wire is not in the circuit. The resistance of the wire is comparable to that of a light bulb.
(a) When the switch is closed, what happens to the brightness of each bulb, A and B?
(b) Suppose we now make the nichrome wire longer. How does the brightness of each bulb change when this is done?
(See attached file for full problem description)
This solution involves solving various problems about lightbulbs. Detailed equations are provided.