Question

give two reason for the variation of G at equator and the other pole one marke

Answer 1

I think u mean 'g' because 'G' is fixed but acceleration due to gravity changes at pole and equator because:

The earth is not a perfect sphere thus the distance from centre to surface is more at equator than at poles.(Earth is like an orange, pressed at poles)

so, g changes at g=GM/R2 and R is more on equator than on pole.

This is the reason I learnt last year.

Hope it helps, it can be accepted for a one marker :)

Answer 2

Explanation:

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