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TS EAMCET · Maths · Three Dimensional Geometry

Let \(L\) be the line parallel to the vector \(\sqrt{2} \hat{\mathbf{i}}-5 \hat{\mathbf{j}}+3 \hat{\mathbf{k}}\) and passing through the point A given by \(\hat{\mathbf{i}}+2 \hat{\mathbf{j}}-3 \hat{\mathbf{k}}\). If the distance between \(A\) and a point \(P\) on the line \(L\) is 18 units, then the position vector of such a point \(P\) is

  1. A \((1-3 \sqrt{2}) \hat{\mathbf{i}}+17 \hat{\mathbf{j}}-12 \hat{\mathbf{k}}\)
  2. B \((1+3 \sqrt{2}) \hat{\mathbf{i}}+17 \hat{\mathbf{j}}+12 \hat{\mathbf{k}}\)
  3. C \((1+3 \sqrt{2}) \hat{\mathbf{i}}-17 \hat{\mathbf{j}}-12 \hat{\mathbf{k}}\)
  4. D \((1-3 \sqrt{2}) \hat{\mathbf{i}}-17 \hat{\mathbf{j}}+12 \hat{\mathbf{k}}\)
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Correct Answer

(A) \((1-3 \sqrt{2}) \hat{\mathbf{i}}+17 \hat{\mathbf{j}}-12 \hat{\mathbf{k}}\)

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Detailed explanation

A line \(L\) passing through \(\hat{\mathbf{i}}+2 \hat{\mathbf{j}}-3 \hat{\mathbf{k}}\) and parallel to vector \(\sqrt{2} \hat{\mathbf{i}}-5 \hat{\mathbf{j}}+3 \hat{\mathbf{k}}\) is…
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