Bulb X has electrical resistance R, and bulb Y has resistance 2R. The two bulbs are connected in parallel to an ideal battery that maintains a constant potential difference across each bulb. Which statement best describes their brightness?
a) Bulb Y is brighter than bulb X
b) Bulbs X and Y have the same brightness
c) Bulb X is brighter than bulb Y
d) The relative brightness depends on the magnitude of the battery’s emf