Question

I need just answer. And some discussion in the comment box.

Answer 1

$\text{Magnitude of an vector A} = \sqrt{A.A}$

Answer is first option.

$If A = x i + y j + z k\\ \\ |A| = \sqrt{x^2+y^2+z^2}\\ \\ |A| = \sqrt{A.A}$

Answer 2

Answer:

Magnitude of an vector A=

A.A

Answer is first option.

\begin{lgathered}If A = x i + y j + z k\\ \\ |A| = \sqrt{x^2+y^2+z^2}\\ \\ |A| = \sqrt{A.A}\end{lgathered}

IfA=xi+yj+zk

∣A∣=

x

2

+y

2

+z

2

∣A∣=

A.A