Question 27 - CBSE Class 12 Sample Paper for 2021 Boards - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at August 10, 2026 by Teachoo

Find the vector equation of the plane that passes through the point (1, 0, 0) and contains the line r ^→ = ⋏i ̂ j ̂

Find vector equation of plane that passes through the point (1,0,0)

Question 27 - CBSE Class 12 Sample Paper for 2021 Boards - Part 2

Question 27 - CBSE Class 12 Sample Paper for 2021 Boards - Part 3

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Transcript

Equation of plane passing through point A whose position vector is 𝒂 ⃗ & perpendicular to 𝒏 ⃗ is (𝒓 ⃗ − 𝒂 ⃗) . 𝒏 ⃗ = 0 Given Plane passes through (1, 0, 0) So 𝒂 ⃗ = 1𝑖 ̂ + 0𝑗 ̂ − 0𝑘 ̂ 𝒂 ⃗ = 𝑖 ̂ Thus, equation of plane is (𝑟 ⃗ − 𝑎 ⃗) . 𝑛 ⃗ = 0 (𝒓 ⃗ − 𝒊 ̂) . 𝒏 ⃗ = 0 Now, The plane contains the line 𝑟 ⃗= 𝜆𝑗 ̂ So, Line is perpendicular to normal of plane 𝒋 ̂ . 𝒏 ⃗ = 0 And, Lines point (0, 0, 0) lies on plane as well Putting 𝑟 ⃗ = 0 ⃗ in equation of plane (0 ⃗ − 𝑖 ̂) . 𝑛 ⃗ = 0 − 𝑖 ̂ . 𝑛 ⃗ = 0 𝒊 ̂ . 𝒏 ⃗ = 0 Since 𝒏 ⃗ perpendicular to both 𝒊 ̂ and 𝒋 ̂ Thus, 𝒏 ⃗ = 𝒌 ̂ So, our equation of plane becomes (𝑟 ⃗ − 𝑖 ̂) . 𝑛 ⃗ = 0 (𝒓 ⃗ − 𝒊 ̂) . 𝒌 ̂ = 0 𝑟 ⃗ . 𝑘 ̂ − 𝑖 ̂ . 𝑘 ̂ = 0 𝒓 ⃗ . 𝒌 ̂ = 0

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