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JEE MAIN 2021
25-07-21 S2
Question
Two vectors $\vec{X}$ and $\vec{Y}$ have equal magnitude. The magnitude of $(\vec{X}-\vec{Y})$ is $n$ times the magnitude of $(\vec{X}+\vec{Y})$. The angle between $\vec{X}$ and $\vec{Y}$ is
Select the correct option:
A
$\cos ^{-1}\left(\frac{-n^2-1}{n^2-1}\right)$
B
$\cos ^{-1}\left(\frac{n^2-1}{-n^2-1}\right)$
C
$\cos ^{-1}\left(\frac{n^2+1}{-n^2-1}\right)$
D
$\cos ^{-1}\left(\frac{n^2+1}{n^2-1}\right)$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
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Physics
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