JEE Main 2019 — Physics solution | Fundamenthol

JEE Main2019Physics

Q.

Two vectors $A$ and $B$ have equal magnitudes. The $(A + B)$ magnitude of is ‘n’ times the magnitude of $(A - B)$ . The angle between $A$ and $B$ is :

A
$cos^{- 1} [\frac{n - 1}{n + 1}]$
B
$cos^{- 1} [\frac{n ^{2} - 1}{n ^{2} + 1}]$
C
$sin^{- 1} [\frac{n - 1}{n + 1}]$
D
$sin^{- 1} [\frac{n ^{2} - 1}{n ^{2} + 1}]$

Solution

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