The argument of the complex number - 1 + i 3 is ............. ^ - Vidyadip

MCQ

The argument of the complex number $ - 1 + i\sqrt 3 $ is ............. $^\circ$

A
$-60$
B
$60$
✓
$120$
D
$-120$

✓

Answer

Correct option: C.

$120$

c
(c)$arg( - 1 + i\sqrt 3 ) = {\tan ^{ - 1}}\left( {\frac{{\sqrt 3 }}{{ - 1}}} \right) = {120^o}$
because it lies in second quadrant.

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