Question

All the bulbs below are identical. Which bulb(s) shine(s) most brightly ?

• A. 1 only
• B. 2 only
• C. 3 and 4
• D. 1 and 5

Answer 1

The correct option is D 1 and 5

The brightness of a bulb is proportional to the power supplied to the bulb $=i^{2}R$.
Since the bulbs are identical, the resistance of all of them is same.
Maximum current flows through 1 and 5 that further divides into bulbs 3, 4 and 2.
So, option (D) is correct.