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If the vectors `a = i-j+2k, b =2i+4j+k` and `c=lambdai+j+mu k` are mutually orthogonal, then `(lambda,mu) = `

A

`(2, -3)`

B

`(-2,3)`

C

`(3,-2)`

D

`(-3,2)`

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The correct Answer is:
D
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ML KHANNA-ADDITION AND MULTIPLICATION OF VECTORS -Problem Set (2) (MULTIPLE CHOICE QUESTIONS)
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  7. Find lambda such that the scalar product of the vector vec i + vec j +...

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  8. If a = i + 2j - 3k, b = 3i - j + 2k, then angle between a + b and a - ...

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  9. If a = 2i + 3j + 6k, b=3i - 6j + 2k then a xx b is a vector

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  10. Let vec(a) = hat(i) + hat(j) + hat(k), vec(b) = hat(i) - hat(j) + 2hat...

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  11. Number of vectors ofunit length perpendicular to vectors bara equiv (1...

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  12. A unit vector normal to the plane through the point i,2j,3k is :

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  13. A, B and C are three vectors given by 2hat(i)+hat(k), hat(i)+hat(j)+ha...

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  15. Given a=i+j-k, b=-i+2j+k" and "c=-i+2j-k. A unit vector perpendicular ...

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  16. Find vectors perpendicular to the plane of vectors a=2i-6j+3k" and "b=...

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  17. Read the following passage and answer the questions. Consider the line...

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  18. The unit vector perpendicular to vector i -j and i + j forming a righ...

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  19. If the position vectors of three points A, B, C are respectively i+j+k...

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  20. A unit vector normal to the plane through the point i,2j,3k is :

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