JEE MATHEMATICS MCQ: DIFFERENTIAL EQUATIONS

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Application +4 | -1

A normal is drawn at a

P\left( {x,y} \right)

of a curve. It meets the

x

-axis at

Q

. if

PQ

is of constant length

k

, then the differential equation describing such a curve is

View answer and explanation

Correct option: A

y\frac{{dy}}{{dx}} = \pm \sqrt {{k^2} - {y^2}}

Option A (

y\frac{{dy}}{{dx}} = \pm \sqrt {{k^2} - {y^2}}

) is correct because it represents the differential equation relating the length of the normal to the y-coordinate.

More Questions from DIFFERENTIAL EQUATIONS

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y=y(x)

\left(3 y^{2}-5 x^{2}\right) y d x+2 x\left(x^{2}-y^{2}\right) d y=0

y(1)=1

\left|(y(2))^{3}-12 y(2)\right|

x

{x^2} + {y^2} = 1

\left( {y' = \frac{{dy}}{{dx}},y'' = \frac{{{d^2}y}}{{d{x^2}}}} \right)

x = A\cos 4t + B\sin 4t,

\frac{{{d^2}x}}{{d{t^2}}}

y=y_{1}(x)

y=y_{2}(x)

\frac{d y}{d x}=y+7

y_{1}(0)=0

y_{2}(0)=1

y=y_{1}(x)

y=y_{2}(x)

y=y(t)

\frac{d y}{d t}+\alpha y=\gamma e^{-\beta t}

\alpha>0, \beta>0

\gamma>0

\lim \limits_{{x \rightarrow \infty}} y(t)