A coil has a horizontal axis. Its current goes North on top. What is the direction of the magnetic field inside this coil?
To determine the direction of the magnetic field inside a coil with a horizontal axis and a current going north on top, you can use the right-hand rule.
1. First, extend your right hand and align your fingers with the direction of the current. In this case, align your fingers in the northward direction.
2. Now, curl your fingers towards the center of the coil (in a counterclockwise direction, if looking from the top). Keep your thumb pointing upwards.
3. The direction your thumb is pointing to represents the direction of the magnetic field inside the coil.
In this scenario, the magnetic field inside the coil would be pointing upwards, perpendicular to the horizontal axis of the coil.