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Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will be:

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

Correct answer: 1: 4

Solution

Two equal capacitors C in series give C/2; in parallel give 2C. The ratio of equivalent capacitances series:parallel = (C/2):(2C) = 1:4.

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