JEE Main 2022 · 25 Jun · Shift 1 · Physics Q32

← JEE Main 2022 · 25 Jun · Shift 1

PhysicsSingle correct+4 / -1Question 32 of 90

$\vec A$ is a vector quantity such that $|\vec A|=$ non-zero constant. Which of the following expression is true for $\vec A$ ?

\vec A\cdot\vec A=0

\vec A\times\vec A<0

\vec A\times\vec A=0

\vec A\times\vec A>0

Answer and worked solution

Official answer: C

Cross product of a vector with itself is the zero vector, $|\vec A|^2\sin0=0$ . ( $\vec A\cdot\vec A=|\vec A|^2\ne0$ , and a vector cannot be "< 0" or "> 0".)

(C)

Topics:Vectors

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JEE Main 2022 · 25 Jun · Shift 1, Physics question 32