Question

A vector $\overrightarrow{F_1}$ is along $x$-axis. If its vector product with another vector $\overrightarrow{F_2}$ is zero, then $\overrightarrow{F_2}$ could be

• A. $4\hat{j}$
• B. $-(\hat{i}+\hat{j})$
• C. $\hat{j}+\hat{k}$
• D. $-4\hat{i}$

Answer 1

The correct option is D $-4\hat{i}$

Given vector is also along $x$-axis. The angle between them is zero. So vector would be along x-axis which can be $-4\hat{i}.$