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10. vector algebra — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMaths10. vector algebra1 Mark
MCQ
The vector $2\,i + a\,j + k$ is perpendicular to the vector $2\,i - j - k,$ if $a = $
  • A
    $5$
  • B
    $-5$
  • C
    $-3$
  • ✓
    $3$
✓

Answer

Correct option: D.
$3$
d
(d)  $a.b = 0 = 4 - a - 1 \Rightarrow a = 3.$

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