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JEE Mains · Maths · STD 11 - 10.2 parabola,ellipse,hyperbola

જો પરવલયો \(y ^{2}=4 x\) અને \(x ^{2}=4 y\) નો સામાન્ય સ્પર્શકો વર્તુળ \(x^{2}+y^{2}=c^{2}\) ને સ્પર્શે હોય તો \(c\) ની કિમત શોધો

  1. A \(\frac{1}{2}\)
  2. B \(\frac{1}{2 \sqrt{2}}\)
  3. C \(\frac{1}{\sqrt{2}}\)
  4. D \(\frac{1}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{1}{\sqrt{2}}\)

Step-by-step Solution

Detailed explanation

\(y=m x+\frac{1}{m}\left(\operatorname{tangent} a t y^{2}=4 x\right)\) \(y=m x-m^{2}\left(\operatorname{tangent} a t x^{2}=4 y\right)\) \(\frac{1}{ m }=- m ^{2}\) (for common tangent) \(m ^{3}=-1\) \(m=-1\) \(y=-x-1\) \(x+y+1=0\) This line touches circle \(\therefore\) apply…
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