4-1.Complex numbers
normal

જો $z$ એ શુદ્ધ વાસ્તવિક સંખ્યા છે કે જેથી ${\mathop{\rm Im}\nolimits} \,(z) > 0$. તો $arg(z)$ = . . . ..

A

$\pi $

B

$\frac{\pi }{2}$

C

$0$

D

$ - \frac{\pi }{2}$

Solution

(b)Let $z = 0 + ib$, where $b > 0$. Then $z$lies on +ve $y$-axis and so $arg(z) = \frac{\pi }{2}$.

Standard 11
Mathematics

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