Two light bulbs, B₁ and B₂, are connected to a battery having appreciable internal resistance as shown in the figure. What happens to the brightness of bulb B₁ when we close the switch S? A) The brightness of B₁ increases permanently. B) The brightness of B₁ decreases permanently. C) The brightness of B₁ does not change. D) The brightness of B₁ increases temporarily but gradually decreases back to its original brightness. E) The brightness of B₁ decreases temporarily but gradually increases back to its original brightness.

Question

Quizplus · Accepted Answer

When the switch is closed, the internal resistance of the battery causes the voltage across both bulbs to drop. This means that the brightness of both bulbs decreases permanently. However, since B₁ has a lower resistance than B₂, it will experience a greater decrease in brightness. Therefore, the brightness of B₁ decreases permanently.

Two Light Bulbs, B1 and B2, Are Connected to a Battery

Two Light Bulbs, B₁ and B₂, Are Connected to a Battery