Question

A steel rod is located at the magnetic north pole of the earth. It is partially embedded into the ground. After a long time, the rod acquires magnetic properties, then -

• A. The end of the rod embedded in the ground will become the North Pole
• B. The end of the rod embedded in the ground will become the South Pole
• C. Cannot be predicted
• D. None of the above

Answer 1

The correct option is B The end of the rod embedded in the ground will become the South Pole


Consider the magnetic field lines of earth's magnetic field.

These lines will enter the rod through the end embedded into the ground and exit through its other end, which is above the ground.

With this orientation of field lines, the lower end of the rod will become its South Pole and the upper end (which is in air) will become North Pole.

Hence, option $\left(B\right)$ is correct.