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Sixty four conducting drops each of radius 0.02 m and each carrying a charge of 5 μ C are combined to form a bigger drop. The ratio of surface density of bigger drop to the smaller drop will be:

1. 1 : 4
2. 4 : 1
3. 1 : 8
4. 8 : 1

Correct answer: 4 : 1

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