Question

The order of differential equation of all circles of given radius $'a'$ is _____

• A. 4
• B. 2
• C. 1
• D. 3

Answer 1

Answer: (B)

2

Answer 2

Let the centre of circle be $( h , k )$ and radius $a$, then its equation will be
$(x-h)^{2}+(y-k)^{2}=a^{2}$
Since, there are two parameters $h$ and $k .$ So, the differential equation is of order 2