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Vector Algebra question

2021 · 18 Mar · Shift 1 · Q31

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PYQ Library
JEE Main
Mathematics
Vector Algebra
2021 · 18 Mar · Shift 1 · Q31

Vector Algebra question

2021 · 18 Mar · Shift 1 · Q31

JEE MainMathematicsVector AlgebraMCQ+4 / −1

A vector

\overrightarrow a

has components 3p and 1 with respect to a rectangular cartesian system. This system is rotated through a certain angle about the origin in the counter clockwise sense. If, with respect to new system,

\overrightarrow a

has components p + 1 and

\sqrt {10}

, then the value of p is equal to :

A
1
B
$- {5 \over 4}$
C
${4 \over 5}$
D
$-$ 1

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