

InterviewSolution
Saved Bookmarks
1. |
Find the differential equation of system of cocentric circles with centre (1,2) |
Answer» The family of concentric circles with centre (1, 2) and radius a is given by `" "(x-1)^(2)+(y-2)^(2)=a^(2)` `rArr" "x^(2)+1-2x+y^(2)+4-4y=a^(2)` `rArr" "x^(2)+y^(2)-2x-4y+5=a^(2)` On differentiating Eq. (i) w.r.t. x, we get `" "2x+2y(dy)/(dx)-2-4(dy)/(dx)=0` `rArr" "(2y-4)(dy)/(dx)+2x-2=0` `rArr" "(y-2)(dy)/(dx)+(x-1)=0` |
|