# Simple alternating current circuits

### Explanation of question 5

A coil of negligible resistance is connected across a fixed frequency AC supply. The output voltage from the supply is now doubled. The reactance of the coil will be

1. halved
2. unaltered
3. doubled
4. four times the original value

The answer is :- 2 Inductive reactance, XL = 2 x PI x F x L , i.e. is not a function of voltage.

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