Question

which property of a magnet is used to find the direction on the earth​

Answer 1

The freely suspended magnet always show the north direction

It’s a story about an emperor in China named Hoang Ti. It is said that he had a chariot with a statue of a lady that could rotate in any direction. It had an extended arm as if it was showing the way. The statue had an interesting property. It would rest in such a position that its extended arm always pointed towards the south. By looking at the extended arm of the statue, the Emperor was able to locate directions when he went to new places on his chariot. It worked on the principle of a magnetic compass.

Due to this property magnetic compass was used by sailors to find the direction in the seas and ocean.