If $|{z_1} + {z_2}| = |{z_1} - {z_2}|$, then the difference in the amplitudes of ${z_1}$ and ${z_2}$ is
If $|{z_1} + {z_2}| = |{z_1} - {z_2}|$, then the difference in the amplitudes of ${z_1}$ and ${z_2}$ is
- A
$\frac{\pi }{4}$
- B
$\frac{\pi }{3}$
- C
$\frac{\pi }{2}$
- D
$0$
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