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  • Need solution for RD Sharma maths class 12 chapter 28 The Plane exercise multiple choice question 23

Need solution for RD Sharma maths class 12 chapter 28 The Plane exercise multiple choice question 23

Answers (1)

Answer:

 Option (a)

Hint:

 Find magnitude of n vector.

Given:

 \overrightarrow{r}.\left ( \frac{2}{7}\widehat{i}+\frac{3}{7}\widehat{j}-\frac{6}{7}\widehat{k} \right )=1

Solution:

\overrightarrow{r}.\left ( \frac{2}{7}\widehat{i}+\frac{3}{7}\widehat{j}-\frac{6}{7}\widehat{k} \right )=1

Let,

\begin{aligned} &\overrightarrow{n}=\left ( \frac{2}{7}\widehat{i}+\frac{3}{7}\widehat{j}-\frac{6}{7}\widehat{k} \right )\\ &\left | \overrightarrow{n} \right |=\sqrt{\left ( \frac{2}{7} \right )^2+\left ( \frac{3}{7} \right )^2+\left ( -\frac{6}{7} \right )^2}\\ &=1 \end{aligned}

 N is a unit vector.

Posted by

Gurleen Kaur

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