Question

why value of g is greater on the poles then other places

Answer 1

Lots of places state that the Earth's gravity is stronger at the poles than the equator for two reasons: The centrifugal force cancels out the gravity minimally, more so at the equator than at the poles. The poles are closer to the center due to the equatorial bulge, and thus have a stronger gravitational field.

Answer 2

value of g is greater on poles becuse earth is in sperical shaped . so at centre radius is smaller as they reach towards poles the value of g increases..