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The moment of the couple formed by the f...

The moment of the couple formed by the forces ` 5hati +hatj and -5hati - hatk` acting at the points (9 ,-1,2) and ( 3,-2,1) respectively, is

A

`-hati + hatj + 5hatk`

B

`hati - 11hatj + 5hatk`

C

`-hati + 11hatj + 5hatk`

D

`hati - hatj - 5hatk`

Text Solution

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The correct Answer is:
D
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