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Slide46.JPG

Slide47.JPG

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

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‹ ๐‘Ž โƒ— . ๐‘ โƒ— = "|" ๐‘Ž โƒ—"|" "|" ๐‘ โƒ—"|" cos ฮธ where ฮธ is the angle between ๐‘Ž โƒ— and ๐‘ โƒ— 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

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.