Two Light Bulbs,B₁ and B₂,are Connected to a Battery Having

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.

Correct Answer:

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