Question 3 - CBSE Class 12 Sample Paper for 2020 Boards - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at Dec. 16, 2024 by Teachoo

If (2i + 6j + 27k ) × (i + pj + qk ) = 0 , then the values of p and q are?

(a) p = 6, q = 27 (b) p = 3, q = 27/2

(c) p = 6, q = 27/2 (d) p = 3, q = 27

If (2i + 6j + 27k ) x (i + pj + qk ) = 0 , then the values of p and q

Question 3 - CBSE Class 12 Sample Paper for 2020 Boards - Part 2

Next: Question 4 → Share on WhatsApp

Transcript

Question 3 If (2𝑖 ̂ + 6𝑗 ̂ + 27𝑘 ̂ ) × (𝑖 ̂ + p𝑗 ̂ + q𝑘 ̂) = 0 ⃗ , then the values of p and q are? (a) p = 6, q = 27 (b) p = 3, q = 27/2 (c) p = 6, q = 27/2 (d) p = 3, q = 27 Given (2𝑖 ̂ + 6𝑗 ̂ + 27𝑘 ̂ ) × (𝑖 ̂ + p𝑗 ̂ + q𝑘 ̂) = 0 ⃗ Therefore, |■8(𝑖 ̂&𝑗 ̂&𝑘 ̂@2&6&27@1&𝑝&𝑞)|=0𝑖 ̂+0𝑗 ̂+0𝑘 ̂ 𝑖 ̂(6q – 27p) – 𝑗 ̂(2q – 27) + 𝑘 ̂(2p – 6) = 0𝑖 ̂+0𝑗 ̂+0𝑘 ̂ Comparing 6q – 27p = 0 2q – 27 = 0 2q = 27 q = 27/2 2p – 6 = 0 2p = 6 p = 6/2 = 3 Therefore, p = 3, q = 𝟐𝟕/𝟐 So, (b) is the correct answer

Made by

Davneet Singh

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

Class 6

Class 7

Class 8

Class 9

Class 10

Class 11

Class 12

Courses

Interesting

Popular