A circuit contains two light bulbs connected in parallel. What would happen to the brightness of each light bulb if two more light bulbs were added in parallel to the first ones?

In a parallel circuit, each bulb is connected across the same voltage source, so adding more parallel bulbs does not change the voltage across the original bulbs. Their brightness therefore remains the same, while the circuit’s total resistance decreases as more branches are added. Choice B correctly describes both effects.

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