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For any vector vec r, (vec r . i)^(2) + ...

For any vector `vec r, (vec r . i)^(2) + (vec r .j)^(2) + (vec r . k )^(2) =`

A

1

B

`|vec r|`

C

`vec r`

D

`|vec r|^(2)`

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The correct Answer is:
D
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