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Let vec a, vec b and vec c are vectors o...

Let `vec a, vec b and vec c` are vectors of magnitude 3,4,5 respectively. If `vec a` is perpendicular to `vec b+ vec c` , `vec b` is perpendicular to `vec c + vec a` and `vec c` is perpendicular to `vec a+ vec b` then find the magnitude of `vec a + vec b + vec c`

A

`4sqrt2`

B

`3sqrt2`

C

`5sqrt2`

D

`3sqrt3`

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The correct Answer is:
C
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DISHA PUBLICATION-VECTOR ALGEBRA-EXERCISE -1 : CONCEPT BUILDER
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  2. If f is the centre of a circle inscribed in a triangle ABC, then |vec...

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  3. Let vec a, vec b and vec c are vectors of magnitude 3,4,5 respectively...

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  4. If veca , vecb , vec c are any three coplanar unit vectors , then :

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  5. The vector veca=alpha hati+2hatj+betahatk lies in the plane of vectors...

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  6. Let vecu= hati+hatj, vecv = hati -hatj and vecw = hati+2hatj+3hatk. I...

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  7. If vectors a=4hat(i)-3hat(j)+6hat(k) and vector b=-2hat(i)+2hat(j)-hat...

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  8. A vector of magnitude 14 lies in the xy-plane and makes an angle of 60...

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  9. If veca,vecb,vec c are unit vectors such that veca+vecb+vec c= vec0 fi...

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  10. The two variable vectors 3xhati+yhatj-3hatk and xhati-4yhatj+4hatk are...

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  11. Angle between the vectors sqrt3(veca xx vec b) " and " vec b - (veca ....

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  12. If the vector veca = (2 ,log3 x ,a ) and vecb = (-3,a log3x,log3x) are...

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  13. If veca , vecb ,vec c are the 3 vectors such that |veca| = 3, |vecb| ...

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  14. The vectors (2hati - mhatj+ 3mk) and {(1 + m) hati -2m hatj + hatk} i...

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  15. Let veca , vecb , vecc be three unit vectors such that |veca + vecb +...

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  16. If veca,vecb and vecc are three vectors of which every pair is non col...

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  17. The two vectors (x^2 - 1)hati +(x+2)hatj + x^2 hatk and 2hati -xhatj +...

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  18. The value of 'a' for which the points A, B,C with position vectors ...

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  19. For any vector veca the value of (vecaxxhati)^2+(vecaxxhatj)^2+(vecaxx...

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  20. If (veca xx vecb) xx vecc = vec a xx (vecb xx vecc), where veca, vecb ...

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