Medium MCQ +4 / -1 PYQ · JEE Mains 2024

Let $P Q$ be a chord of the parabola $y^2=12 x$ and the midpoint of $P Q$ be at $(4,1)$. Then, which of the following point lies on the line passing through the points $\mathrm{P}$ and $\mathrm{Q}$ ?

  1. A $(3,-3)$
  2. B $\left(\frac{1}{2},-20\right)$ Correct answer
  3. C $(2,-9)$
  4. D $\left(\frac{3}{2},-16\right)$

Solution

<p>$y^2=12 x$</p> <p>Chord $P Q$ having mid-point $(x_1, y_1)=(4,1)$ equation of chord $P Q$</p> <p>$$\begin{aligned} & T=S_1 \\ & y y_1-12 \frac{\left(x+x_1\right)}{2}=y_1^2-12 x_1 \\ & y-6(x+4)=1-12 \times 4 \\ & y-6 x-24=-47 \\ & y-6 x+23=0 \end{aligned}$$</p> <p>From option (4) $x=\frac{1}{2}$ & $y=-20$</p> <p>$-20-6 \times \frac{1}{2}+23=0$</p>

About this question

Subject: Mathematics · Chapter: Conic Sections · Topic: Parabola

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