MHT CET · Maths · Three Dimensional Geometry

If the foot of the perpendicular drawn from the origin to a plane is \(M(-1,-2,2)\), then the vector equation of the plane is

A \(\bar{r} \cdot(-\hat{i}-2 \hat{j}+2 \widehat{k})=9\)
B \(\bar{r} \cdot(\widehat{i}+2 \widehat{j}+2 \widehat{k})=9\)
C \(\bar{r} \cdot(-\hat{i}-2 \hat{j}-2 \widehat{k})=9\)
D \(\bar{r} \cdot(\hat{i}+2 \hat{j}-2 \widehat{k})=9\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(\bar{r} \cdot(-\hat{i}-2 \hat{j}+2 \widehat{k})=9\)

Step-by-step Solution

Detailed explanation

D.r's of normal to the plane \(<-1,-2,2>\)
D.c's of Normal to the plane \(<-\frac{1}{3},-\frac{2}{3}, \frac{2}{3}>\)
length of perpendicular \(=\sqrt{1^2+2^2+(-2)^2}=3\)
Hence, Equation of plane \(\vec{r} \cdot\left(-\frac{1}{3} \hat{i}-\frac{2}{3} \hat{j}+\frac{2}{3} \hat{k}\right)=3\)
\(\Rightarrow \vec{r} \cdot(-\hat{i}-2 \hat{j}+2 \widehat{k})=9\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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