Practice Questions CBSE - Maths Class 12 (2023 Boards)

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Question 15 - Practice Questions CBSE - Maths Class 12 (2023 Boards) - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at April 16, 2024 by

(PQ) is perpendicular to (QR) . The position vectors of P, Q and R are (4i ̂+7j ̂-k ̂), (5i ̂+yj ̂+k ̂ ) and (-2i ̂+9j ̂+4k ̂ ) respectively.

What is the value of y?

A. -9

B. -8

C. 7

D. 8

 

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Transcript

(𝑷𝑸) ⃗ is perpendicular to (𝑄𝑅) ⃗. The position vectors of P, Q and R are (4𝑖 ̂+7𝑗 ̂−𝑘 ̂), (5𝑖 ̂+𝑦𝑗 ̂+𝑘 ̂ ) and (−2𝑖 ̂+9𝑗 ̂+4𝑘 ̂ ) respectively. What is the value of y? A. -9 B. -8 C. 7 D. 8

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo