Question

A = $3\widehat{i} + 4\widehat{j}$ Find a vector perpendicular to $\overrightarrow{A}$ in the plane of $\overrightarrow{A}$

• A. $\widehat{k}$
• B. $- 3\widehat{i} - 4\widehat{j}$
• C. $4\widehat{j} - 3\widehat{i}$
• D. $4\widehat{i} - 3\widehat{j}$

Answer 1

Answer: (D)

$4\widehat{i} - 3\widehat{j}$

Answer 2

(1) is also perpendicular to $\overrightarrow{A}$ but not in the same plane. Check using $\overrightarrow{A}$.$\overrightarrow{B}$ = 0