Study the circuit. If Bulb B2 fuses, how many bulbs will remain lit?
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Worked Solution
Step 1: Analyze the circuit: Bulb B1 is on the main series wire. Bulbs B2 and B3 are on separate parallel branches.
Step 2: Current flows from the battery, through B1, and then splits to go through B2 and B3 before returning to the battery.
Step 3: If B2 fuses, the path through B2 is broken.
Step 4: Current can still flow through the main wire (B1) and the other parallel branch (B3).
Step 5: Therefore, B1 and B3 remain lit (2 bulbs).
Correct answer: 2
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