Question

Out of the given matrices, choose that matrix which is a scalar matrix:

(a) $\left[\begin{array}{cc}0& 0\\ 0& 0\end{array}\right]$

(b) $\left[\begin{array}{ccc}0& 0& 0\\ 0& 0& 0\end{array}\right]$

(c) $\left[\begin{array}{cc}0& 0\\ 0& 0\\ 0& 0\end{array}\right]$

(d) $\left[\begin{array}{c}0\\ 0\\ 0\end{array}\right]$

Answer 1

$\left(a\right)\left[\begin{array}{cc}0& 0\\ 0& 0\end{array}\right]$

A diagonal matrix in which all the diagonal elements are equal is called the scalar matrix.