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Work Done as Dot Product

If A⃗ = 3 i...

Question

If $\to A = 3 i + 2 j - k$ and $\to B = 2 i + 4 j - 14 k$ , then angle between $\to A$ and $\to B$ is:-

A

0^{\circ}

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B

60^{\circ}

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C

90^{\circ}

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D

30^{\circ}

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Solution

The correct option is C $90^{\circ}$
We find that dot product of vector A and vector B is 0.So the angle between them is 90 degree.

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