मराठी

Find the value of λ such that the vectors aijka→=2i^+λj^+k^ and bijkb→=i^+2j^+3k^ are orthogonal ______. - Mathematics

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प्रश्न

Find the value of λ such that the vectors `vec"a" = 2hat"i" + lambdahat"j" + hat"k"` and `vec"b" = hat"i" + 2hat"j" + 3hat"k"` are orthogonal ______.

पर्याय

  • 0

  • 1

  • `3/2`

  • `- 5/2`

MCQ
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उत्तर

Find the value of λ such that the vectors `vec"a" = 2hat"i" + lambdahat"j" + hat"k"` and `vec"b" = hat"i" + 2hat"j" + 3hat"k"` are orthogonal `- 5/2`.

Explanation:

Given that `vec"a" = 2hat"i" + lambdahat"j" + hat"k"` 

And `vec"b" = hat"i" + 2hat"j" + 3hat"k"`

Since `vec"a"` and `vec"b"` are orthogonal

∴ `vec"a" * vec"b"` = 0

⇒ `(2hat"i" + lambdahat"j" + hat"k") * (hat"i" + 2hat"j" + 3hat"k")` = 0

⇒ 2 + 2λ + 3 = 0

⇒ 5 + 2λ = 0

⇒ λ = `(-5)/2`

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पाठ 10: Vector Algebra - Exercise [पृष्ठ २१७]

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एनसीईआरटी एक्झांप्लर Mathematics [English] Class 12
पाठ 10 Vector Algebra
Exercise | Q 23 | पृष्ठ २१७
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