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## Homework Statement

(a) For spherical coordinates, show that [itex]\hat{\theta}[/itex] points along the negative z-axis if [itex]\theta[/itex] = 90°.

(b) If [itex]\phi[/itex] also equals 90°, in what direction are [itex]\hat{r}[/itex] and [itex]\hat{\phi}[/itex]?

## Homework Equations

## The Attempt at a Solution

can i just explain this in words.. like

for a.

since we are rotating about the z axis , if theta is 90°, theta will automatically point to negative z-axis

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