Question

Suppose we synchronize two atomic clocks at a point at 45° south latitude, and then move one clock directly north to the earth's equator and the other directly south to the south pole, where they remain for some years in climate-controlled enclosures that keep them at the same temperature and humidity. We then reunite the clocks at the origin point and compare them again. Which (if either) has registered a shorter time between the synchronization and comparison events? A. The clock at the equator B. The clock at the south pole C. Both clocks read the same time.

Answer 1

When you are closer to the surface of earth you feel greater gravitational force. Due to rotation of earth there is a bulge on earth's equator. So at the equator gravitational force is smaller because there you are relatively higher to the surface in compared to the pole. Hence gravity slows down the clock on the equator, since there is lower gravitational force so it ticks more slowly , and it registers shorter time in compared to the clock on the pole.

Option A is correct.