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Physics-

General

Easy

Question

A vector $stack F subscript 1 end subscript with rightwards arrow on top$ is along the positive $Y$ -axis. If its vector product with another vector $stack F subscript 1 end subscript with rightwards arrow on top$ is zero, then $stack F subscript 2 end subscript with rightwards arrow on top$ could be

4 $\hat{j}$
$\hat{j} + \hat{k}$
$\hat{j} - \hat{k}$
$- 4 \hat{i}$

The correct answer is: 4 $stack j with hat on top$

$stack F subscript 1 end subscript with rightwards arrow on top equals F subscript 1 end subscript stack j with hat on top semicolon stack F subscript 1 end subscript with rightwards arrow on top cross times stack F subscript 2 end subscript with rightwards arrow on top$ is equal to zero only I angle between $stack F subscript 1 end subscript with rightwards arrow on top$ and $stack F subscript 2 end subscript with rightwards arrow on top$ is either $0 degree$ or 180 $degree$ . So $stack F subscript 2 end subscript with rightwards arrow on top$ will be 4 $stack j with hat on top$ .

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