Q. If $z_{1} = \sqrt{2}\left( \cos{\frac{\pi}{4} + i\sin\frac{\pi}{4}} \right)$ And $z_{2} = \sqrt{3}\left( \cos{\frac{\pi}{3} + i\sin\frac{\pi}{3}} \right)$, then $\left| z_{1}z_{2} \right|$ is

A) 6
B) $\sqrt{2}$
C) $\sqrt{6}$
D) $\sqrt{3}$
Explanation

(c)
$\left| z_{1} \right| = \sqrt{2},\ \ \left| z_{2} \right| = \sqrt{3}$
$\therefore\ \ \ \ \ \ \left| z_{1}z_{2} \right| = \left| z_{1} \right||z_{2} = \sqrt{6}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.