Mathematics in Physics

JEE Main level, single correct, medium

48 of 121

Question 48 of 121

A⃗\vec{A} is a vector quantity such that ∣A⃗∣=\left|\vec{A}\right|= non-zero constant. Which of the following expression is true for A⃗\vec{A}?

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Answer: (C) A⃗×A⃗=0\vec{A}\times \vec{A}=0

Since both the vectors are same, they will be parallel to each other. We know that vector product of two parallel vectors is zero.
Hence,
A⃗×A⃗=0\vec{A}\times \vec{A}=0 is the correct answer.

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