# Variation in *g* Due to Shape of Earth

Earth is elliptical in shape. It is flattened at the poles and bulged out at the equator. The equatorial radius is about 21 km longer than polar radius.

**Fig. 2**

From

Since

*R*_{equator}>*R*_{pole}*âˆ´*

*g*

_{pole}>

*g*

_{equator}and

*g*=

_{p}*g*+ 0.018 m/s

_{e}^{2}

Therefore, the weight of body increases as it is taken from equator to pole.