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Physics Question on Forces

The moment of the couple formed by the forces 5i^+k^5\hat{i}+\hat{k} and −5i^−k^-5\hat{i}-\hat{k} acting at the points (9, -1, 2) and (3, -2, 1) respectively, is

A

11r^−j^+5k^11\hat{r}-\hat{j}+5\hat{k}

B

−i^+11j^−5k^-\hat{i}+11\hat{j}-5\hat{k}

C

−i^+11j^+5k^-\hat{i}+11\hat{j}+5\hat{k}

D

i^−j^−5k^\hat{i}-\hat{j}-5\hat{k}

Answer

i^−j^−5k^\hat{i}-\hat{j}-5\hat{k}

Explanation

Solution

The correct answer is(D): i^−j^−5k^\hat{i}-\hat{j}-5\hat{k}