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if y = mx is a chord of a circle of radi...

if `y = mx` is a chord of a circle of radius `a` and the diameter of the circle lies along `x`-axis and one end of this chord in origin .The equation of the circle described on this chord as diameter is

A

`(1+m^(2))(x^(2)+y^(2))-2a(x+my)=0`

B

`(1-m^(2))(x^(2)+y^(2))-2a(x+my)=0`

C

`(1+m^(2))(x^(2)+y^(2))+2a(x+my)=0`

D

none of these

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The correct Answer is:
A
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OBJECTIVE RD SHARMA-CIRCLES-Exercise
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  2. Three sided of a triangle have equations L1-=y-mi x=o; i=1,2a n d3. Th...

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  4. 18. The straight lines joining the origin to the points of intersectio...

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  6. If the chord of contact of tangents from a point (x1, y1) to the circl...

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  7. The circle S1 with centre C1 (a1, b1) and radius r1 touches externall...

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  8. Two vertices of an equilateral triangle are (-1,0) and (1, 0), and its...

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  11. The value of theta in [0, 2pi] so that circle x^(2)+y^(2)+2 (sin alpha...

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  12. The value of alpha in [0,2pi] so that x^(2)+y^(2)+2sqrt(sin alpha )...

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  13. If in a DeltaABC (whose circumcentre is at the origin), a leq sinA ,...

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  14. If P is a point such that the ratio of the squares of the lengths of t...

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  15. If C(1),C(2),C(3),... is a sequence of circles such that C(n+1) is the...

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  16. If r1a n dr2 are the radii of the smallest and the largest circles, re...

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  17. The radical centre of three circles described on the three sides x+y=5...

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  18. If theta is the angle between the two radii (one to each circle) drawn...

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  19. The number of rational point(s) [a point (a, b) is called rational, if...

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