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Q.
When you move from equator to pole, the value of acceleration due to gravity $(g)$ :
AFMCAFMC 2004
Solution:
Equatorial radius is about $21 km$ larger than polar radius.
Earth is not a perfect sphere but some what flat at the two poles. Its equatorial radius is nearly $21 km$ larger than polar radius. Also the value of $g$ depends upon $R_{e}$ (radius of earth) as
$g=\frac{G M_{e}}{R_{e}^{2}}$
Hence, as we go from equator towards the poles the radius $R_{e}$ goes on decreasing and hence the value of $g$ goes on increasing.