🛠️ JEE➗ Maths

Let three vectors \( \vec{a}, \vec{b} \) and \( \vec{c} \) be such that \( \vec{a} \times \vec{b}=\vec{c}, \vec{b} \time…

Q1

Let three vectors \( \vec{a}, \vec{b} \) and \( \vec{c} \) be such that \( \vec{a} \times \vec{b}=\vec{c}, \vec{b} \times \vec{c}=\vec{a} \) and \( |\vec{a}|=2 \). Then which one of the following is not true?

[JEE Main 2021, 22 Jul (Shift 2)]

a

\( \vec{a} \times((\vec{b}+\vec{c}) \times(\vec{b}-\vec{c}))=\overrightarrow{0} \)

b

Projection of \( \vec{a} \) on \( (\vec{b} \times \vec{c}) \) is \( 2 \)

c

\( \left[\begin{array}{lll}\vec{a} & \vec{b} & \vec{c}\end{array}\right]+\left[\begin{array}{lll}\vec{c} & \vec{a} & \vec{b}\end{array}\right]=8 \)

d

\( |3 \vec{a}+\vec{b}-2 \vec{c}|^{2}=51 \)

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