Ex 10.3, 18 (MCQ) - Chapter 10 Class 12 Vector Algebra (Term 2)
Last updated at Aug. 11, 2021 by Teachoo
Transcript
Ex 10.3, 18 If ๐ โ is a nonzero vector of magnitude โaโ & ฮป a nonzero scalar, then ฮป๐ โ is unit vector if (A) ฮป = 1 (B) ฮป = โ 1 (C) a = |ฮป| (D) a = 1/|"ฮป" | Given, magnitude of vector ๐ โ is โaโ So, |๐ โ | = a For a non zero scalar โฮปโ ฮป๐ โ is a unit vector Magnitude of ฮป๐ โ is 1 So, |"ฮป" ๐ โ | = 1 |"ฮป" ||๐ โ | = 1 |"ฮป" | ๐ = 1 ๐ = 1/|"ฮป" | Hence, D is the correct answer.
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