Eight identical spherical drops, each carrying charge 1 nC are at a potential of 900 V each. All these drops combine together to from a single large drop. Assume no wastage of any kind. Take capacitance of a sphere of radius r as proportional to r.

Explanation

To solve the problem step by step, we need to find the potential of the large drop formed by combining eight identical spherical drops, each carrying a charge of 1 nC and having a potential of 900 V.

### Step 1: Understand the charge on each small drop
Each small drop has a charge \( Q = 1 \, \text{nC} = 1 \times 10^{-9} \, \text{C} \).

### Step 2: Calculate the total charge when the drops combine
When all eight drops combine, the total charge \( Q' \) on the large drop is:
\[
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