# Simple alternating current circuits

### Explanation of question 10

A 40F capacitor is connected across a 12V DC supply. Its reactance will be

1. infinitely low
2. 3.33
3. 3.33M
4. infinitely high

The answer is :- 4 A d.c. supply has zero frequency. Xc = 1 / (2 x PI x F x C) = 1 / 0 i.e. Infinitely high

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