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bar(a)xx[bar(a)xx(bar(a)xx bar(b))] = ……...

`bar(a)xx[bar(a)xx(bar(a)xx bar(b))]` = …………….

A

`(bar(a)xx bar(a))*(bar(b)xx bar(a))`

B

`bar(a)*(bar(b)xx bar(a))-bar(b)*(bar(a)xx bar(b))`

C

`[bar(a)*(bar(a)xx bar(b))]bar(a)`

D

`(bar(a)*bar(a))(bar(b)xx bar(a))`

Text Solution

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The correct Answer is:
D
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KUMAR PRAKASHAN-VECTOR ALGEBRA -Solutions of NCERT Exemplar Problems (Multiple Choice Questions (MCQs) )
  1. The vectors bar(a) and bar(b) are perpendicular then bar(a)xx{bar(a)xx...

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  2. If bar(a),bar(b),bar( c ) and bar(d) are coplanar vectors then (bar(a)...

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  3. bar(a)xx[bar(a)xx(bar(a)xx bar(b))] = …………….

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  4. For three vectors bar(a),bar(b) and bar( c ),bar(a)xx(bar(b)xx bar( c ...

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  5. If bar(a)=hati+hatj+hatk,bar(b)=hati+hatj,bar( c )=hati and (bar(a)xx ...

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  6. [bar(a)xx bar(b)" "bar(a)xx bar( c )" "bar(d)] = …………….

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  7. If (bar(a)xx bar(b))xx(bar(b)xx bar( c ))=bar(b), where bar(a),bar(b),...

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  8. If bar(a),bar( c ) and bar(d) are not coplanar vectors and bar(d).(bar...

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  9. If 4bar(a)+5bar(b)+9bar( c )=0 then (bar(a)xx bar(b))xx[(bar(b)xx bar(...

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  10. vec(a),vec(b) and vec( c ) are non zero vectors. (vec(a)xx vec(b))xx v...

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  11. If vec(a) is a unit vector and vec(b)=(2,1,-1) and vec( c )=(1,0,3). T...

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  12. The volume of the parallelepiped with edges -12hati+alpha hatk,3hatj-h...

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  13. bar(a)xx[bar(a)xx(bar(a)xx bar(b))] = …………….

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  14. vec(a)|vec(b) and vec(c),|vec(a)|=2,|vec(b)|=3,|vec( c )|=4. The angle...

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  15. (vec(a)xx vec(b))xx vec( c )=vec(a)xx(vec(b)xx vec( c )). If vec(a)*ve...

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  16. vec(u),vec(v) and vec(w) are not co-planar vectors and p and q are rea...

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  17. Let vec(X),vec(Y) and vec(Z) be three vectors such that |vec(X)|=|vec(...

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  18. Let vec(X),vec(Y) and vec(Z) be three vectors such that |vec(X)|=|vec(...

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  19. Let vec(X),vec(Y) and vec(Z) be three vectors such that |vec(X)|=|vec(...

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  20. Measure of the angle between the vector vec(a)=hati-hatj+hatk and vec(...

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