Q. 11

# Write the order of the differential equation of the family of circles touching X-axis at the origin.

Differential Equation of the family of circles touching X-axis at the origin is

= x2 + (y – k)2 = k2

Here (0,k) is the center of the circle and radius k.

= x2 + y2 + k2 – 2 × k × y = k2

= x2 + y2 – 2 × k × y = 0 ---(1)

Differentiate w.r.t x we get,

Put value of k in (1) we get,

is the differential equation of the family of circles touching X-axis at the origin.

Here the order of differential equation of the family of circles touching X-axis at the origin is 1.

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