# Alternating quantities

### Explanation of question 7

Two sinusoidal currents of 10 A have the same frequency, but are 180° out of phase. When added, the resultant current will be

1. zero
2. 10A
4. 20A

The answer is :- 1 Two sine waves of equal magnitude180° out of phase effectively cancel each other out. The positive peak of one coincides with the negative peak of the other.

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