# Simple alternating current circuits

### Explanation of question 9

A parallel-plate air-spaced capacitor is connected across a fixed frequency supply. If the distance between the plates is halved, its reactance will be

1. halved
2. the same
3. times its initial value
4. doubled

The answer is :- 1 If the distance between the plates is halved, C will double. Xc = 1 / (2 x PI x F x C), so if C is doubled Xc will be halved

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