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Question

Taking O' as origin and the position vectors of A,B are i+3j2k,3i+j2k. The vector OC is bisecting the angle AOB and if C is a point on line AB then C is

A
4(i+jk)
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B
2(i+jk)
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C
(i+jk)
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D
6(i+jk)
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Solution

The correct option is B 2(i+jk)
Taking magnitude of vectors

OA=(01)2+(03)2+(0+2)2=14

and OB=(03)2+(01)2+(0+2)2=14

So, ACCB=11
Applying Section Formula

C=B+A2

C=i+3j2k+3i+j2k2
C=2(^i+^j^k)

55423_35629_ans.JPG

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