The circuit at right shows four identical bulbs connected to an ideal 6V battery and a switch that is initially closed. Rank the bulbs in order from brightest to dimmest. If two bulbs have the same brightness, indicate that explicitly. Explain how you determined the ranking of the bulbs. (Hint: draw arrows to trace the path of current from the battery.) The switch is now opened. Will the current through bulb A increase, decrease, or remain the same? Explain how you determined your answer. (Hint: draw arrows to trace the path of current from the battery.)
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