Question

A vector $\overset{\rightarrow}{F_{1}}$ is along the positive x-axis. If its vector product with another vector $\overset{\rightarrow}{F_{2}}$ is zero then $\overset{\rightarrow}{F_{2}}$ may be -

• A. (a) $4\widehat{j}$
• A. (b) $–(\widehat{i} + \widehat{j})$
• A. (c) $(\widehat{i} + \widehat{k})$
• A. (d) $- 4\widehat{i}$

Answer 1

(d)

$\overset{\rightarrow}{F_{1}}$ = F₁ $\widehat{i}$ and F₁ $\widehat{i}$ × $( - 4\widehat{i})$ = 0