Slide51.JPG

Slide52.JPG

 

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

Transcript

Misc 18 (Introduction) The value of ๐‘– ฬ‚.(๐‘— ฬ‚ ร— ๐‘˜ ฬ‚) + ๐‘— ฬ‚. (๐‘– ฬ‚ ร— ๐‘˜ ฬ‚) + ๐‘˜ ฬ‚.(๐‘– ฬ‚ ร— ๐‘— ฬ‚) (A) 0 (B) โˆ’1 (C) 1 (D) 3 ๐‘– ฬ‚ ร— ๐‘— ฬ‚ = ๐‘˜ ฬ‚ ๐‘— ฬ‚ ร— ๐‘˜ ฬ‚ = ๐‘– ฬ‚ ๐‘˜ ฬ‚ ร— ๐‘– ฬ‚ = ๐‘— ฬ‚ ๐‘— ฬ‚ ร— ๐‘– ฬ‚ = โ€“๐‘˜ ฬ‚ ๐‘˜ ฬ‚ ร— ๐‘— ฬ‚ = โˆ’๐‘– ฬ‚ ๐‘– ฬ‚ ร— ๐‘˜ ฬ‚ = โˆ’๐‘— ฬ‚ Misc 18 The value of ๐‘– ฬ‚.(๐‘— ฬ‚ ร— ๐‘˜ ฬ‚) + ๐‘— ฬ‚. (๐‘– ฬ‚ ร— ๐‘˜ ฬ‚) + ๐‘˜ ฬ‚.(๐‘– ฬ‚ ร— ๐‘— ฬ‚) (A) 0 (B) โˆ’1 (C) 1 (D) 3 Now, ๐‘– ฬ‚.(๐‘— ฬ‚ ร— ๐‘˜ ฬ‚) + ๐‘— ฬ‚. (๐‘– ฬ‚ ร— ๐‘˜ ฬ‚) + ๐‘˜ ฬ‚.(๐‘– ฬ‚ ร— ๐‘— ฬ‚) = ๐‘– ฬ‚.(๐’Š ฬ‚) + ๐‘— ฬ‚.(โˆ’๐’‹ ฬ‚) + ๐‘˜ ฬ‚ .(๐’Œ ฬ‚) = ๐‘– ฬ‚. ๐‘– ฬ‚ โˆ’ ๐‘— ฬ‚ . ๐‘— ฬ‚ + ๐‘˜ ฬ‚. ๐‘˜ ฬ‚ = 1 โ€“ 1 + 1 = 1 So, option C is correct ๐‘– ฬ‚. ๐‘– ฬ‚ = |๐‘– ฬ‚ ||๐‘– ฬ‚ | cos 0 = 1 ร— 1 ร— 1 = 1 Similarly, ๐‘— ฬ‚ . ๐‘— ฬ‚ = ๐‘˜ ฬ‚ . ๐‘˜ ฬ‚ = 1

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
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.