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If three vectors `vec(a), vec(b), vec(c )` are such that `vec(a) ne vec(0) and vec(a) xx vec(b)=2 (vec(a) xx vec(c )), |vec(a)| = |vec(c )| =1, |vec(b)|=4` and the angle between `vec(b) and vec(c )` is `cos^(-1) ((1)/(4))`, then `vec(b)-2vec(c )= lamda vec(a)` where `lamda`=

A

0

B

4

C

2

D

3

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The correct Answer is:
B
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AAKASH SERIES-VECTOR (CROSS) PRODUCT OF TWO VECTORS-Practice Exercise
  1. A vector vec( c) perpendicular to the vectors 2vec(i) + 3vec(j)-vec(k)...

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  2. The vectors vec(a) and vec(b) are not perpendicular and vec(c ) and ve...

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  3. If three vectors vec(a), vec(b), vec(c ) are such that vec(a) ne vec(0...

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  4. Assertion (A): The area of the triangle with vertices (1,2,3), (2, 5, ...

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  5. The area of the parallelogram is 4sqrt29 sq.u. If one of adjacent side...

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  6. ABCD is a quadrilateral with vec(AB)= vec(a), vec(AD)= vec(b) and vec(...

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  7. The perpendicular distance from A(1, 4, -2) to BC, where B= (2, 1, -2)...

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  8. If vec(AB)= vec(b) and vec(AC)= vec( c), then the length of the perpen...

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  9. The torque about the point 2i + j - K of a force represented by 4i + k...

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  10. Assertion (A): The torque about the point 3vec(i)-vec(j) + 3vec(k) of ...

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  11. If vec(a) xx vec(b)= vec(c ) xx vec(d), vec(a) xx vec(c )= vec(b) xx v...

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  12. (2 vec(i) + 4vec(j) + 2vec(k)) xx (2vec(i) -p vec(j) + 5vec(k))=16 vec...

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  13. If vec(a)= vec(i) + vec(j) + vec(k), vec(b)= 2vec(i)-3vec(j) + vec(k),...

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  14. If |bar(P)| = 2, |bar(q)| = 3 and (bar(p),bar(q)) = (pi)/6, then find ...

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  15. If vec(u)= vec(a)- vec(b), vec(v)= vec(a) + vec(b) and |vec(a)| =|vec(...

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  16. The vector area of the rectangle whose adjacent sides are p vec(i), q ...

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  17. If vec(r )= x vec(i) + y vec(j) + z vec(k) then (vec(r ) xx vec(i)).(v...

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  18. If u and v are unit vectors and theta is the acute angle between them,...

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  19. A unit vector normal to the plane through the points vec(i), 2vec(j) ...

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  20. If the vectors vec(a), vec(b), vec(c ) are represents the sides vec(BC...

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