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Q. The equation of the hyperbola whose foci are (–2,0) and (2, 0) and eccentricity is 2 is given by :
(1) $-3 x^{2}+y^{2}=3$
(2) $x^{2}-3 y^{2}=3$
(3) $3 x^{2}-y^{2}=3$
(4) $-x^{2}+3 y^{2}=3$
[AIEEE-2011]
Ans. (3)
$2 \mathrm{ae}=4$
$\mathrm{ae}=2$
$\mathrm{a}(2)=2$
$\mathrm{a}=1$
$\mathrm{b}^{2}=\mathrm{a}^{2}\left(\mathrm{e}^{2}-1\right)$
$\begin{aligned}=& 1(4-1)=3 \\ \text { equation } & \frac{\mathrm{x}^{2}}{1}-\frac{\mathrm{y}^{2}}{3}=1 \\ & 3 \mathrm{x}^{2}-\mathrm{y}^{2}=3 \end{aligned}$
Q. A tangent to the hyperbola $\frac{x^{2}}{4}-\frac{y^{2}}{2}=1$ meets $x$ -axis at $P$ and $y$ -axis at Q. Lines PR and QR are drawn such that OPRQ is a rectangle (where O is the origin). Then R lies on :
(1) $\frac{2}{x^{2}}-\frac{4}{y^{2}}=1$
(2) $\frac{4}{x^{2}}-\frac{2}{y^{2}}=1$
(3) $\frac{4}{x^{2}}+\frac{2}{y^{2}}=1$
(4) $\frac{2}{x^{2}}+\frac{4}{y^{2}}=1$
[JEE-Main (On line)-2013]
Ans. (2)
Tangent is $\frac{x}{2} \sec \theta-\frac{y}{\sqrt{2}} \tan \theta=1$
$P\left(\frac{2}{\sec \theta}, 0\right), Q\left(0,-\frac{\sqrt{2}}{\tan \theta}\right)$
$R\left(\frac{2}{\sec \theta},-\frac{\sqrt{2}}{\tan \theta}\right)=(h, k)$
Locus of $R \Rightarrow \quad \frac{4}{h^{2}}-\frac{9}{k^{2}}=1=\frac{4}{x^{2}}-\frac{9}{y^{2}}=1$
Q. A common tangent to the conics $x^{2}=6 y$ and $2 x^{2}-4 y^{2}=9$ is :
(1) $x+y=\frac{9}{2}$
(2) $x+y=1$
(3) $x-y=\frac{3}{2}$
(4) x – y = 1
[JEE-Main (On line)-2013]
Ans. (3)
Equation of tangent for $\frac{x^{2}}{(9 / 2)}-\frac{y^{2}}{(9 / 4)}=1$
is $y=m x \pm \sqrt{\frac{9}{2} m^{2}-\frac{9}{4}}$
and tangent to $x^{2}=6 y$ is $y=m x-\frac{3}{2} m^{2}$ ....(2)
Now equated ( 1) and ( 2)
Q. The eccentricity of the hyperbola whose length of the latus rectum is equal to 8 and the length of its conjugate axis is equal to half of the distance between its foci, is :
(1) $\sqrt{3}$
(2) $\frac{4}{3}$
(3) $\frac{4}{\sqrt{3}}$
(4) $\frac{2}{\sqrt{3}}$
[JEE-Main 2016]
Ans. (4)
Given
$\frac{2 \mathrm{b}^{2}}{\mathrm{a}}=8$
$2 \mathrm{b}=\mathrm{ae}$
we know
$\mathrm{b}^{2}=\mathrm{a}^{2}\left(\mathrm{e}^{2}-1\right)$
substitute $\frac{\mathrm{b}}{\mathrm{a}}=\frac{\mathrm{e}}{2}$ from ( 2) in ( 3)
$\Rightarrow \frac{\mathrm{e}^{2}}{4}=\mathrm{e}^{2}-1 \Rightarrow 4=3 \mathrm{e}^{2}$
$\Rightarrow \mathrm{e}=\frac{2}{\sqrt{3}}$
Q. A hyperbola passes through the point $\mathrm{P}(\sqrt{2}, \sqrt{3})$ and has foci at $(\pm 2,0) .$ Then the tangent to this hyperbola at $\mathrm{P}$ also passes through the point:
(1) $(-\sqrt{2},-\sqrt{3})$
(2) $(3 \sqrt{2}, 2 \sqrt{3})$
(3) $(2 \sqrt{2}, 3 \sqrt{3})$
(4) $(\sqrt{3}, \sqrt{2})$
[JEE-Main 2017]
Ans. (3)
Equation of hyperbola is $\frac{x^{2}}{a^{2}}-\frac{y^{2}}{b^{2}}=1$
foci is $(\pm 2,0)$ hence ae $=2, \Rightarrow a^{2} e^{2}=4$
$b^{2}=a^{2}\left(e^{2}-1\right)$
$\therefore a^{2}+b^{2}=4$ ...(1)
Hyperbola passes through $(\sqrt{2}, \sqrt{3})$
$\therefore \frac{2}{\mathrm{a}^{2}}-\frac{3}{\mathrm{b}^{2}}=1$ ...(2)
On solving ( 1) and ( 2)
$\mathrm{a}^{2}=8(\text { is rejected })$ and $\mathrm{a}^{2}=1$ and $\mathrm{b}^{2}=3$
$\therefore \frac{\mathrm{x}^{2}}{1}-\frac{\mathrm{y}^{2}}{3}=1$
Equation of tangent is $\frac{\sqrt{2} \mathrm{x}}{1}-\frac{\sqrt{3} \mathrm{y}}{3}=1$
Hence $(2 \sqrt{2}, 3 \sqrt{3})$ satisfy it.
Q. Tangents are drawn to the hyperbola $4 \mathrm{x}^{2}-\mathrm{y}^{2}=36$ at the point $\mathrm{P}$ and $\mathrm{Q}$. If these tangents intersect at the point $\mathrm{T}(0,3)$ then the area (in sq. units) of $\Delta \mathrm{PTQ}$ is –
(1) $54 \sqrt{3}$
(2) $60 \sqrt{3}$
(3) $36 \sqrt{5}$
(4) $45 \sqrt{5}$
[JEE-Main 2018]
Ans. (4)
Equation PQ : chord of contact T = 0
y = – 12
Comments
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Aug. 31, 2021, 7:41 p.m.
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To turn
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