B₁, B₂, and B₃ are three identical bulbs connected to a battery with a steady e.m.f. and the key K closed. What happens to the brightness of bulbs B₁ and B₂ when the key is opened?

Question

Brightness of bulb B₁ decreases and that of B₂ increases.

Brightness of bulbs B₁ and B₂ decrease.

Brightness of bulbs B₁ increases and that of B₂ decreases.

Brightness of bulbs B₁ and B₂ increases.

Solution

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