Multiple choice

For the spherical surface x2 + y2 + z2 = 1, the unit outward vector at the point $\Big(\frac{1}{\sqrt{2}} , \frac{1}{\sqrt{2}}, 0\Big)$ is given by

  1. $\frac{1}{\sqrt{2}}i + \frac{1}{\sqrt{2}}j$
  2. $\frac{1}{\sqrt{2}}i + \frac{1}{\sqrt{2}}j$
  3. $\hat{k}$
  4. $\frac{1}{\sqrt{3}}\hat{i} + \frac{1}{\sqrt{3}}\hat{j} + \frac{1}{\sqrt{3}}\hat{k}$
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B Correct answer
Explanation

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