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Locus of the point P , for which vec(OP)...

Locus of the point P , for which `vec(OP)` represents a vector with direction cosine `cos alpha =(1)/(2)` (where O is the origin) is

A

a circle parallel to the y-z plane with centre on the x-axis

B

a cone concentric with the positive x-axis having vertex at the origin and the slant height equal to the magnitude of the vector

C

a ray emanating from the origin and making an angle of `60^(@)` with the x-axis

D

a disc parallel to the y-z plane with centre on the x-axis and radius equal to `|vec(OP)|sin60^(@)` .

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The correct Answer is:
B
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