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Question

For a coaxial system x2+y2+2μy+c=0 radical axis is

A
x=0
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B
y=0
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C
y=c
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D
y+c=0
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Solution

The correct option is B y=0
x2+y2+2μy+c=0 is a coaxial system of circle So, s1:x2+y2+2μ1y+c=0
s2:x2+y2+2μ2y+c=0
So, eqn of radical axis of system is
s1s2=0
y(μ1μ2)=0
y=0

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