1.

(a,0) and (b, 0) are centres of two circles belonging to a co-axial system of which y-axis is the radical axis. If radius of one of the circles 'r', then the radius of the other circle is

Answer»

`(r^2+B^2+a^2)^(1//2)`
`(r^2+b^2-a^2)^(1//2)`
`(r^2+b^2-a^2)^(1//3)`
`(r^2+b^2+a^2)^(1//3)`

ANSWER :B


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