1.

From the origin chords are drawn to the circle\[{{(x-1)}^{2}}+{{y}^{2}}=1\]. The equation of the locus of the middle points of these chords is [IIT 1985; EAMCET 1991]

A.            \[{{x}^{2}}+{{y}^{2}}-3x=0\]         
B.            \[{{x}^{2}}+{{y}^{2}}-3y=0\]
C.            \[{{x}^{2}}+{{y}^{2}}-x=0\]
D.            \[{{x}^{2}}+{{y}^{2}}-y=0\]
Answer» D.            \[{{x}^{2}}+{{y}^{2}}-y=0\]


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