QJEEM08Ma643a: JEE Main 2008 Physics - Class 11 JEEM08Ma643a Solution: The non-zero vectors are a → , b → and c → are related by a → = …

Question

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The non-zero vectors are

\vec{a}, \vec{b}

and

\vec{c}

are related by

\vec{a} = 8 \vec{b}

and

\vec{c} = - 7 \vec{b} .

Then the angle between

\vec{a}

and

\vec{c}

is :

Accepted Answer

Clearly

\vec{a} = - \frac{8}{7} \vec{c}

\Rightarrow \vec{a} | | \vec{c}

and are opposite in direction

∴

Angle between

\vec{a}

and

\vec{c}

is

π .

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