Q. Order of the differential equation of the family of all concentric circles centred at $(h,k)$ is
A) 1
B) 2
C) 3
D) 4
Explanation
(a)
$(x - h)^{2} + (y - k)^{2} = r^{2}$, here only one arbitrary constant $r$. So, order of differential equation = 1.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.