How can electric currents and magnets exert force on each other?

Answer 1

Electric currents and magnetic fields are by nature and by definition related to each other. In general, a magnetic field is created by the rotation of charge. If you imagine an electron following a circular path, a magnetic field would be created in the direction perpendicular to the plane of the circle.

On the other hand, electric current is defined as the flow of charge. So, an electron flowing along a wire results in current flow. This also means that the electron following a circular path (as above) creates an electric current along that same path.

If a circular flow of current results in a magnetic field perpendicular to the circle, what happens for current flow along a straight wire? Basically, we see a magnetic field which bends around the wire. Imagine exactly the reverse as before, with the magnetic field circling around the direction of current flow.

This basic relationship between electric current and magnetic fields results in some interesting interactions:

1. Many electromagnets work by the following principle: A coil of wire is made so that when voltage is applied the current will follow a circular path. As discussed above this circular movement of charge results in a magnetic field. In this case, you can imagine the direction of the magnetic field as the line through the center of the wire coil.

2. The Hall Effect: When current is applied across a conductive slab and a magnetic field is applied perpendicular to current flow, a voltage is generated in the third perpendicular direction. This occurs due to the interaction of the magnetic field generated by the flow of current and the applied magnetic field.

Answer 2

The main one is that electric current, which consists of electric charges flowing along a wire, sets up a magnetic field around the wire. The field lines are circles, with the magnetic field at right-angles to the current. The magnetic field intensity at distance r from the wire is given in SI units by:

H = i/(2.pi.r)

The second is magnetic induction, in which a voltage is induced in a loop of wire if the total magnetic flux linking that loop changes. The voltage induced in the wire loop (in SI units) is:

V = d(flux)/dt.

Answer 3

Type your answer here....

Answer 4

an event is a train floating above the track.

Answer 5

A change in either one produces the other. This is most completely expressed in Maxwell's Equations.

Answer 6

Describe an event involving electric and magnetic forces. Use your imagination. Describe the cause and effec of each force.