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STD 12 - 10. vector algebra — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 10. vector algebra4 Marks
MCQ
If $a \times (b \times c) = 0,$ then
  • A
    $|a|\, = \,|b|\,.\,|c|\, = 1$
  • ✓
    $b||c$
  • C
    $a||b$
  • D
    $b\, \bot \,c$
✓

Answer

Correct option: B.
$b||c$
b
(b) $a \times (b \times c) = 0 \Rightarrow a||(b \times c)$ or $b \times c = 0$

i.e., $b||c$ or $a = 0.$

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