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The differential equation of the family of parabola with focus at the origin and the x-axis an axis, isA. `y((dy)/(dx))^(2)+4x(dy)/(dx)=4y`B. `y((dy)/(dx))^(2)=2x(dy)/(dx)-y`C. `y((dy)/(dx))^(2)+y=2xy(dy)/(dx)`D. `y((dy)/(dx))^(2)+2xy(dy)/(dx)+y-0` |
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Answer» Correct Answer - B The equation of the family of parabolas with focus at the origin and the x-axis as axis is `y^(2)=2a(x-1)`, where a is parameter.`" …(i)"` Differentiating with respect to x, we get `2y(dy)/(dx)=4arArr a=(y)/(2)(dy)/(dx)` Sunstituting the value of a in (i), we get `y^(2)=2y(dy)/(dx)(x-(y)/(2)(dy)/(dx))` `rArr" "y^(2)=y(dy)/(dx)(2x-y(dy)/(dx))rArry((dy)/(dx))^(2)-2x(dy)/(dx)+y=0` This is the required differential equation. |
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