Question

In above shown figure three identical light bulbs are connected to a source of emf. What will happen if the middle bulb burns out?

• A. All the bulbs will go out.
• B. The light intensity of the other two bulbs will decrease (but they wont go out).
• C. The light intensity of the other two bulbs will increase.
• D. The light intensity of the other two bulbs will remain the same
• E. More current will be drawn from the source of emf.

Answer 1

The correct option is D The light intensity of the other two bulbs will remain the same

Here the three is connected in parallel so potential difference across them will be same. Even when middle bulb is taken out then potential across remaining bulbs will be same. Since $P=V^2/R$ so the intensity of remaining bulbs remain same.