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If vec(u)=hati xx(vec(a)xx hati)+hatj xx...

If `vec(u)=hati xx(vec(a)xx hati)+hatj xx(vec(a)xx hatj)+hatk xx(vec(a)xx hatk)` then `vec(u)` = ………..

A

0

B

`hati+hatj+hatk`

C

`2vec(a)`

D

`vec(a)`

Text Solution

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The correct Answer is:
C
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For any vector vec(a),(vec(a)xx vec(i))^(2)+(vec(a)xx hatj)^(2)+(vec(a)xx vec(k))^(2) = ……….. .

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KUMAR PRAKASHAN-VECTOR ALGEBRA -Solutions of NCERT Exemplar Problems (Multiple Choice Questions (MCQs) )
  1. If vec(a).hati=4 then (vec(a)xx hatj).(2hatj-3hatk)= ………..

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  2. vec(a),vec(b) and vec( c ) are unit vectors vec(a)xx(vec(b)xx vec( c )...

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  3. If vec(u)=hati xx(vec(a)xx hati)+hatj xx(vec(a)xx hatj)+hatk xx(vec(a)...

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  4. For the vectors vec(x) and vec(y),vec(x)+vec(y)=vec(a),vec(x)xx vec(y)...

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  5. Vector vec(a)=hati-hatj,vec(b)=hati+hatj+hatk. The vector vec( c ) is ...

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  6. The vectors vec(a) and vec(b) are not perpendicular. The vectors vec( ...

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  7. vec(a)=hatj-hatk and vec( c )=hati-hatj-hatk. The vector vec(b) is suc...

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  8. For any vector vec(a),(vec(a)xx vec(i))^(2)+(vec(a)xx hatj)^(2)+(vec(a...

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  9. vec(a),vec(b) and vec( c ) are three vector vec(a)ne0 and |vec(a)|=|ve...

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  10. For any vecotr vec(a), The value of hati xx(vec(a)xx hati)+j xx(vec(a)...

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  11. If (a(1),1,1),(1,a(2),1) and (1,1,a(3)) are coplaner (where a(i)ge1,i=...

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  12. If bar(x)=(1,-1,0),bar(y)=(0,1,3) and bar(z)=(2,1,1) then bar(x)xx (ba...

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  13. If [vec(a)xx vec(b),vec(b)xx vec( c ),vec( c )xx vec(a)]=lambda[vec(a)...

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  14. The volume of a parallelepiped with edges vec(OA)=(3,1.4),vec(OB)=(1,2...

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  15. Let vec(a),vec(b) and vec( c ) are three unit vectors such that vec(a)...

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  16. If |bar(a)|=1 and bar(a)xx bar(b)=(1,2,3) then bar(a)xx[bar(a)xx(bar(a...

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  17. If bar(x)xx(bar(y)xx bar(z))=(bar(x)xx bar(y))xx bar(z) then bar(y)xx(...

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  18. Let vec(a)=2hati+hatj-2hatk and vec(b)=hati+hatj. Let the vector vec( ...

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  19. If the unit bar(a),bar(b) and bar( c ) are coplanar then …………..

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  20. If bar(a),bar(b) and bar( c ) are not coplanar then (bar(a)+bar(b)+b...

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