Look at Circuit Y. If switch S1 is opened, which bulb(s) will light up?
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Worked Solution
Step 1: This is a parallel circuit with three branches.
Step 2: Switch S1 is located only on the middle branch with bulb B2.
Step 3: Opening S1 breaks the circuit for the middle branch, so B2 goes out.
Step 4: The top branch (B1) and bottom branch (B3) still form closed loops with the battery, so they will remain lit.
Correct answer: B1 and B3
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