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Question

The locus of the centre of a circle which touch the circles x2+y2−6x−6y+14=0 externally and also the Y - axis is given by


A

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B

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C

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D

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Solution

The correct option is D


Let (x, y) be centre of circle which touch y - axis and given circle.
At any point, the radius of this circle will be equal to 'x' units. Since this circle is touching the given circle which has a radius of two units,
Distance between centres of the two circles = 2 + x

(x3)2+(y3)2=2+x

y210x6y+14=0


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