MCQ
The resultant amplitude of amplitude $a_1$ and $a_2$ with same frequency while phase difference $\frac{\pi}{2}$.
- A$a_1+a_2$
- B$a_1-a_2$
- ✓$\sqrt{a_1^2+a_2^2}$
- D$a_1^2-a_2^2$
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