The power of the origin w.r.t the circle on a focal chord of `y^2 = 4ax` as a diameter is

The power of the origin w.t.the circle on a focal chord of y^(2)=4ax as a diameter is

The radical centre of the circles drawn on the focal chords of y^(2)=4ax as diameters, is

The radical centre of the circles drawn on the focal chords of y^(2)=4ax as diameters, is

The locus of the centre of the circle described on any focal chord of the parabola y^(2)=4ax as the diameter is

The locus of the centre of the circle described on any focal chord of the parabola y^(2)=4ax as the diameter is

The power of the point (1, 2) w.r.t the circle x^2 + y^2-4x-6y - 12 =0 is

The sum of the reciprocals of focal distances of a focal chord PO of y^(2)=4ax is

The sum of the reciprocals of focal distances of a focal chord PQ of y^(2) =4ax is