1.

If a circle passes through the point (a,b) and cuts the circle x^2+y^2=k^2 orthogonally then the locus of its centre is

Answer»

`2ax+2by=a^2+b^2+k^2`
`ax+by=a^2+b^2+k^2`
`x^2+y^2+2ax+2by+k^2=0`
`x^2+y^2-2ax+2by+k^2=0`

ANSWER :A


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