Question

A vector $\overrightarrow{F_1}$ is along x-axis. If $\overrightarrow{F_1}.\overrightarrow{F_2}$ is zero, $\overrightarrow{F_2}$ could be :

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

Answer 1

Answer: (A)

$(\hat{j}+\hat{k})$

Given: $\overrightarrow{F_1}\perp \overrightarrow{F_2}$ so, $\overrightarrow{F_2}$ has to be either in y-z plane or along y-axis or along z-axis.

Only option A satisfies the condition.