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Multiplication with Vectors

Two vectors A...

Question

Two vectors $\to A$ and $\to B$ are at right angles to each other , when

A

\to A + \to B = 0

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B

\to A - \to B = 0

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C

\to A \times \to B = 0

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D

\to A . \to B = 0

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Solution

The correct option is D $\to A . \to B = 0$
$\to A . \to B = | \to A | . | \to B | cos θ$
= $| \to A | . | \to B | cos 90^{\circ}$
$\to A . \to B = 0$

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