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Question

The differential equation of all circles which pass through the origin and whose centres lie on y-axis is

A
(x2y2)dydx2xy=0
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B
(x2y2)dydx+2xy=0
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C
(x2y2)dydxxy=0
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D
(x2y2)dydx+xy=0
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Solution

The correct option is B (x2y2)dydx2xy=0
Equation of a circle is
x2+(ya)2=a2 ...(i)
2x+2ydydx2adydx=0 ...(ii)
From Eqs. (i) and (ii), we get
dydx=2xyx2y2
(x2y2)dydx2xy=0

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