The dot product of two vectors A→ and B→ is zero, if:

A → is zero vector and B → is a non zero vector , A → and B → are both non zero but equal vectors , A → is a non zero vector and B → is a zero vector

A → is zero vector and B → is a non zero vector

A → and B → are both non zero but equal vectors

A → and B → are non zero vectors, perpendicular to each other

A → is a non zero vector and B → is a zero vector

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The dot product of two vectors $\vec{A}$ and $\vec{B}$ is zero, if:

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$\vec{A}$ is zero vector and $\vec{B}$ is a non zero vector

$\vec{A}$ and $\vec{B}$ are both non zero but equal vectors

$\vec{A}$ and $\vec{B}$ are non zero vectors, perpendicular to each other

$\vec{A}$ is a non zero vector and $\vec{B}$ is a zero vector

answer is A, B, D.

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$\vec{A} . \vec{B} = A B \cos θ$ , if $A = 0$ or $B = 0$ or $θ = 90 °$ . Hence, choices (1) , (2) and (4) are correct.

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