`n` identical bulbs are connected in series and illuminated by a power supply . One of the bulbs gets fused. The fused bulb is removed , and the remaining bulbs are again illuminated by the same power supply. Find the fractional change in the illuminated of (a) all the bulbs and (b) one bulb.

Explanation

To solve the problem step by step, we will analyze the situation before and after one bulb gets fused and is removed from the series circuit.

### Step 1: Define the parameters
Let:
- \( n \) = number of identical bulbs
- \( V \) = voltage of the power supply
- \( R \) = resistance of each bulb

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