the direction of the currentI, your fingers curl around the wire in the direction of the field. The magnitude of the field at a distances fromthewireisgivenby s I B o π µ 2 = Eqn. 1 where µ o is the permeability of free space. As you can see fromEqn. 1, the field is stronger the more current there is in the wire or the closer you are to it.
Play with a bar magnet and coils to learn about Faraday's law. Move a bar magnet near one or two coils to make a light bulb glow. View the magnetic field lines. A meter shows the direction and magnitude of the current. View the magnetic field lines or use a meter to show the direction and magnitude of the current. You can also play with electromagnets, generators and transformers!