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Question: Answered & Verified by Expert
If $\vec{c}$ is the unit vector perpendicular to both the vectors
$\overrightarrow{\text { a and }} \overrightarrow{\mathrm{b}}$, then what is another unit vector perpendicular
to both the vectors a and $\overrightarrow{\mathrm{b}}$ ?
MathematicsVector AlgebraNDANDA 2011 (Phase 2)
Options:
  • A $\vec{c} \times \vec{a}$
  • B $\overrightarrow{\mathrm{c}} \times \overrightarrow{\mathrm{b}}$
  • C $-\frac{(\vec{a} \times \vec{b})}{|\vec{a} \times \vec{b}|}$
  • D $\frac{(\vec{a} \times \vec{b})}{|\vec{a} \times \vec{b}|}$
Solution:
1740 Upvotes Verified Answer
The correct answer is: $\frac{(\vec{a} \times \vec{b})}{|\vec{a} \times \vec{b}|}$
Let $\vec{c}$ is the unit vector perpendicular to both the
vectors $\vec{a}$ and $\vec{b}$.

So, A unit vector which is perpendicular to both the
vectors $\vec{a}$ and $\vec{b}$ is $\frac{(\vec{a} \times \vec{b})}{|\vec{a} \times \vec{b}|}$

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