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Question

A point moves such that sum of square of its distances from y axis and zaxis is equal to square of its distance from xzplane, then the locus of point is

A
xaxis
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B
yaxis
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C
zaxis
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D
xyplane
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Solution

The correct option is B yaxis
Let point is P(x,y,z) , then
Distance from yaxis =x2+z2,
Distance from zaxis =y2+x2 and
Distance from xz plane =|y|
According to statement,
(x2+z2)+(y2+x2)=y2
2x2+z2=0
x=0 and z=0
locus of point is yaxis.

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