Q 2252178034.     If `y+3x=0 ` is the equation of a chord of the circle, `x^2+y^2−30x=0`, then the equation of the circle with this chord as diameter is :

JEE 2015 Mains 10 April
A

`x^2+y^2−3x+9y=0`

B

`x^2+y^2−3x−9y=0`

C

`x^2+y^2+3x+9y=0`

D

`x^2+y^2+3x−9y=0 `

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