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If direction cosines of a line are (1)/(...

If direction cosines of a line are `(1)/(c),(1)/(c),(1)/(c)," then. "`

A

`c= pm 3`

B

`c=pm sqrt(3)`

C

` c gt 0`

D

`0 lt c lt 1`

Text Solution

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The correct Answer is:
B
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PREMIERS PUBLISHERS-APPLICATIONS OF VECTOR ALGEBRA-SOLUTION TO EXERCISE 6.10
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  2. If veca and vecb are unit vectors such that [veca, vecb, veca xx vecb]...

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  3. If veca=hati+hatj+hatk,vecb=hati+hatj, vecc= veci and (vecaxxvec...

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  4. If vec(a),vec(b),vec(c) are non-coplanar, non-zero vectors such that [...

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  5. If vec(a),vec(b),vec(c) are three non-coplanar vectors such that vec(a...

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  6. If the volume of the parallelpiped with vec(a)xxvec(b),vec(b)xxvec(c),...

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  7. Consider the vectors, vec(a),vec(b),vec(c),vec(d) such that (vec(a)xxv...

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  8. If vec(a)xx(vec(b)xxvec(c))=(vec(a)xxvec(b))xxvec(c)," where "vec(a),v...

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  9. If bara = 2hati + 3hatj - hatk, barb = hati + 2hatj - 5hatj, barc = 3h...

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  10. The angle between the lines (x-2)/(3)=(y+1)/(-2),z=2and(x-1)/(1)=(2y+3...

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  11. If the line (x-2)/(3)=(y-1)/(-5)=(z+2)/(2)" lies in the plane "x+3y-az...

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  12. The angle between the line vecr=(hati+2hatj-3hatk)+t(2hati+hatj-2hatk)...

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  13. The coordinates of the point where the line vecr=(6hati-hatj-3hatk)+t(...

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  14. Distance from the origin to the plane 3x - 6y + 2z + 7 = 0 is

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  15. The distance between the planes x + 2y + 3z + 7 = 0 and 2x + 4y + 6z +...

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  16. If direction cosines of a line are (1)/(c),(1)/(c),(1)/(c)," then. "

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  17. The vector equation vec(r)=(hat(i)-2hat(j)-hat(k))+t(6hat(j)-hat(k)) r...

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  18. If the distance of the point (1,1,1) from the origin is half of its di...

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  19. If the planes vecr*(2hati-lambda hatj+hatk)=3 and vecr*(4hati+hatj-mu ...

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  20. If the length of the perpendicular from the origin to the plane 2x+3y+...

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