What is the altitude of the north celestial pole for an observer located on the earth's equator?

Form the earth equator its 90 degrees perpendicular to the poles.

Explanation:

The north celestial poles differ from the observer's point of view as form the equator its straight north and as we go south the distance keeps on increasing as the direction changes.  As the north star, Polaris can be seen directly over the north celestial pole