Question:
If vector equation of the line$\frac{x-2}{2}=\frac{2y-5}{-3}=z+1,$ is
$\vec{r}=\left(2\hat{i}+\frac{5}{2} \hat{j}-\hat{k}\right)+\lambda\left(2\hat{i}-\frac{3}{2} \hat{j}+p\hat{k}\right)$ then $p$ is equal to
If vector equation of the line$\frac{x-2}{2}=\frac{2y-5}{-3}=z+1,$ is
$\vec{r}=\left(2\hat{i}+\frac{5}{2} \hat{j}-\hat{k}\right)+\lambda\left(2\hat{i}-\frac{3}{2} \hat{j}+p\hat{k}\right)$ then $p$ is equal to
Updated On: Apr 17, 2024
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The Correct Option is A
Solution and Explanation
The given line is $\frac{x-2}{2}=\frac{2y-5}{-3}=z+1,$
$\Rightarrow \frac{x-2}{2}=\frac{y-\frac{5}{2}}{-\frac{3}{2}}=\frac{z+1}{0}$
This shows that the given line passes through the point $\left(2, \frac{5}{2}, -1\right)$ and has direction ratios $\left(2, -\frac{3}{2}, 0\right).$ Thus, given line passes through the point having position vector $\vec{a}=2\hat{i}+\frac{5}{2} \hat{j}-\hat{k}$ and is parallel to the vector
$\vec{b}=\left(2\hat{i}+\frac{3}{2} \hat{j}-0\hat{k}\right)$. So, its vector equation is
$\vec{r}=\left(2\hat{i}+\frac{5}{2} \hat{j}-\hat{k}\right)+\lambda\left(2\hat{i}-\frac{3}{2} \hat{j}-0\hat{k}\right).$
Hence, $p = 0$
$\Rightarrow \frac{x-2}{2}=\frac{y-\frac{5}{2}}{-\frac{3}{2}}=\frac{z+1}{0}$
This shows that the given line passes through the point $\left(2, \frac{5}{2}, -1\right)$ and has direction ratios $\left(2, -\frac{3}{2}, 0\right).$ Thus, given line passes through the point having position vector $\vec{a}=2\hat{i}+\frac{5}{2} \hat{j}-\hat{k}$ and is parallel to the vector
$\vec{b}=\left(2\hat{i}+\frac{3}{2} \hat{j}-0\hat{k}\right)$. So, its vector equation is
$\vec{r}=\left(2\hat{i}+\frac{5}{2} \hat{j}-\hat{k}\right)+\lambda\left(2\hat{i}-\frac{3}{2} \hat{j}-0\hat{k}\right).$
Hence, $p = 0$
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Concepts Used:
Vector Algebra
A vector is an object which has both magnitudes and direction. It is usually represented by an arrow which shows the direction(→) and its length shows the magnitude. The arrow which indicates the vector has an arrowhead and its opposite end is the tail. It is denoted as
The magnitude of the vector is represented as |V|. Two vectors are said to be equal if they have equal magnitudes and equal direction.
Vector Algebra Operations:
Arithmetic operations such as addition, subtraction, multiplication on vectors. However, in the case of multiplication, vectors have two terminologies, such as dot product and cross product.