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

ધારો કે એક અતિવલયની નાભિઓ \((1,14)\) અને \((1,-12)\) છે. જો તે બિંદુ \((1,6)\) માંથી પસાર થાય, તો તેના નાભિલંબની લંબાઈ __________ છે.

  1. A \(\frac{24}{5}\)
  2. B \(\frac{25}{6}\)
  3. C \(\frac{144}{5}\)
  4. D \(\frac{288}{5}\)
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Correct Answer

(D) \(\frac{288}{5}\)

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\begin{aligned} & \mathrm{be}=13, \mathrm{~b}=5 \\ & \mathrm{a}^2=\mathrm{b}^2\left(\mathrm{e}^2-1\right) \\ & =\mathrm{b}^2 \mathrm{e}^2-\mathrm{b}^2 \\ & =169-25=144 \\ & \text{નાભિલંબની લંબાઈ}=\frac{2 \mathrm{a}^2}{\mathrm{~b}}=\frac{2 \times 144}{5}=\frac{288}{5}\end{aligned}

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