Question

In graphical representation of a vector, we have a vector ${30}^{\circ }$ east of north. This vector can also be named as

Answer 1

A vector making an angle ${30}^{\circ }$ from north on east side, is also making an angle ${60}^{\circ }$ from east on north side.
Therefore, it can also be named as ${60}^{\circ }$ north of east.

Hence, option $\left(\text{C}\right)$ is the right choice.