Find the order of the differential equation of the family of all circles with their centres at the origin.

Find the differential equation of the family of circles with their centre at the origin.

Form the differential equation of the family of circles having their centres at the origin.

Find the differential equation of the family of all circles touching the chi -axis at the origin.

Form the differential equation of the family of all circles touching the y-axis at origin.

Order of the differential equation of the family of all concentric circles centred at (h,k) is

Order of the differential equation of the family of all concentric circles centred at (h,k) is

If the order of the differential equation of the family of circle touching the x - axis at the origin is k, then 2k is equal to

If the order of the differential equation of the family of circle touching the x - axis at the origin is k, then 2k is equal to