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IMSO 2014 Science International — Theory I Question 11

IMSO Science · IMSO 2014 Science International — Theory I

Question 11

Two identical light bulbs are arranged in a circuit with a battery and a switch S, as shown in the figure with the opened switch.

Question illustration

If the switch S is closed, which is the correct statement?
  1. The brightness of bulb A stays the same
  2. The brightness of bulb A increases
  3. The brightness of bulb A decreases
  4. The brightness of bulb B increases