Q. 3

Mark (√) against the correct answer in the following:

If A(1, 2, -3) and B(-1, -2, 1) are the end points of a vector then the direction cosines of are

A. -2, -4, 4

B.

C.

D. none of these

Answer :

Given A(1,2,-3) and B(-1,-2,1)



Property: The position vector of the of the vector joining two points (x1,y1,z1)and (x2,y2,z2) is


So, the position vector of the line joining A and B is




Property: for the vector , Direction cosines dc’s are


Therefore the Dc’s of the vector ,,


= ,,


=,,


=


=

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