Question

The centre and radius of the sphere $|2\vec{r}=(J\vec{i}-\vec{j}+4\vec{k})|=4$ are __________

• A. $(-\frac{3}{2},\frac{1}{2},-2)\space and\space4$
• B. $(-\frac{3}{2},\frac{1}{2},-2)\space and\space2$
• C. $(-\frac{3}{2},\frac{1}{2},-2)\space and\space6$
• D. $(-\frac{3}{2},\frac{1}{2},-2)\space and\space5$

Answer 1

Answer: (B)

$(-\frac{3}{2},\frac{1}{2},-2)\space and\space2$

Answer 2

The correct option is (B): $(-\frac{3}{2},\frac{1}{2},-2)\space and\space2$