JEE MAIN - Mathematics Hindi (2021 - 26th February Evening Shift - No. 13)
यदि सदिश $$\overrightarrow {{a_1}} = x\widehat i - \widehat j + \widehat k$$ और $$\overrightarrow {{a_2}} = \widehat i + y\widehat j + z\widehat k$$ सहसंरेखित हैं, तो सदिश $$x\widehat i + y\widehat j + z\widehat k$$ के समानांतर एक संभावित इकाई सदिश है :
$${1 \over {\sqrt 3 }}\left( {\widehat i - \widehat j + \widehat k} \right)$$
$${1 \over {\sqrt 2 }}\left( { - \widehat j + \widehat k} \right)$$
$${1 \over {\sqrt 2 }}\left( {\widehat i - \widehat j} \right)$$
$${1 \over {\sqrt 3 }}\left( {\widehat i + \widehat j - \widehat k} \right)$$
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