The moment of the couple formed by force...

The moment of the couple formed by forces `5hati+hatk 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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