A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole located?

Explanation

To determine which end of a bar magnet is its north pole when there are no markings, you can follow these steps:

### Step-by-Step Solution:

1. **Gather Materials**: You will need a bar magnet and a compass. If you don't have a compass, you can also use another bar magnet.

2. **Suspend the Bar Magnet**: Tie the bar magnet with a thread so that it can hang freely. Make sure it is not touching any surfaces and can rotate freely.

...