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  • Form the differential equation of the family of ellipses having foci on y-axis and centre at origin.

8. Form the differential equation of the family of ellipses having foci on y-axis and centre at origin.

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Equation of ellipses having foci on y-axis and centre at origin is 
\frac{x^2}{b^2}+\frac{y^2}{a^2} = 1                 -
Now, differentiate w..r.t.  x
\frac{2x}{b^2}+\frac{2y}{a^2}.\frac{dy}{dx}=0\\                                    -(i)
Now, again differentiate w.r.t. x
\frac{2}{b^2}+\frac{2}{a^2}.y^{'}.y^{'}+\frac{2y}{a^2}.y^{''}=0\\ \\ \frac{1}{b^2}=-\frac{1}{a^2}\left ( (y^{'})^2+yy^{''} \right )         -(ii)
Put value from equation (ii) in (i)
Our equation becomes
\frac{2y}{a^2}y^{'}-\frac{2x}{a^2}\left ( (y^{'})^2+yy^{''} \right )=0\\ \\ 2yy^{'}-2(y^{'})^2x+2yy^{''}x=0\\ \\ xyy^{''}-x(y^{'})^2+yy^{'}= 0
Therefore, the required equation is   xyy^{''}-x(y^{'})^2+yy^{'}= 0
 

Posted by

Gautam harsolia

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