1. Chapter 10 Class 12 Vector Algebra (Term 2)
  2. Serial order wise
  3. Miscellaneous

Misc 16 (MCQ) - Chapter 10 Class 12 Vector Algebra (Term 2)

Last updated at Aug. 11, 2021 by

Misc 16 - If θ is angle between two vectors a and b, then a.b >= 0

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  1. Chapter 10 Class 12 Vector Algebra (Term 2)
  2. Serial order wise

    3. Miscellaneous

    Supplementary examples and questions from CBSE →

Transcript

Misc 16 If ฮธ is the angle between two vectors ๐‘Ž โƒ— and ๐‘ โƒ— , then ๐‘Ž โƒ— โ‹…๐‘ โƒ— โ‰ฅ 0 only when (A) 0 < ๐œƒ< ๐œ‹/2 (B) 0 โ‰ค ๐œƒ โ‰ค๐œ‹/2 (C) 0 < ๐œƒ < ฯ€ (D) 0 โ‰ค๐œƒ โ‰ค ๐œ‹ Given, ๐‘Ž โƒ—. ๐‘ โƒ— โ‰ฅ 0 |๐‘Ž โƒ— | |๐‘ โƒ— | cos ฮธ โ‰ฅ 0 Assuming |๐‘Ž โƒ— | โ‰  0 and |๐‘ โƒ— | โ‰  0 cos ฮธ โ‰ฅ 0/|๐‘Ž โƒ— ||๐‘ โƒ— | cos ฮธ โ‰ฅ 0 โˆด 0 โ‰ค ฮธ โ‰ค ๐œ‹/2 So, (B) is the correct answer

Chapter 10 Class 12 Vector Algebra (Term 2)
Serial order wise

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