The equation \[|\mathbf{r}{{|}^{2}}-\mathbf{r}.(2\mathbf{i}+4\mathbf{j}-2\mathbf{k})-10=0\] represents a

The equation \[|\mathbf{r}{{|}^{2}}-\mathbf{r}.(2\mathbf{i}+4\mathbf{j

1.	The equation \[\|\mathbf{r}{{\|}^{2}}-\mathbf{r}.(2\mathbf{i}+4\mathbf{j}-2\mathbf{k})-10=0\] represents a
A.	Circle
B.	Plane
C.	Sphere of radius 4
D.	Sphere of radius 3
E.	None of these
Answer» D. Sphere of radius 3

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The equation \[|\mathbf{r}{{|}^{2}}-\mathbf{r}.(2\mathbf{i}+4\mathbf{j}-2\mathbf{k})-10=0\] represents a

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