Current-carrying wire in a magnetic field
This experiment demonstrates the Lorentz force acting on the wire suspended in a magnetic field Horseshoe magnet.
Educational phase: motivation
- horseshoe magnet wire in the shape of the frame
- connecting wires
The lower horizontal part of the frame is placed between the poles of the magnet. The frame is at rest. When the demonstrator wire connects to a power source, wire deflects. If the magnetic north pole down, swing the wire towards the magnet. Swaps the demonstrator magnet poles (north pole is above), the wire is deflected in the opposite direction, away from the magnet.
The conductor has a current in a magnetic field magnetic force. The cause of the magnetic forces acting on the conductor with current in a magnetic field, the interaction of magnetic fields and current-carrying wire magnetic field of the magnet. The direction of force depends on the position of the magnet to the wire and the direction of current through the conductor. To determine the direction of the magnetic force acting on the direct current-carrying conductor in a homogeneous magnetic field, is Fleming left hand rule: attach the open left hand to direct leads to finger pointing conventional current and magnetic lines entering into the palm, shows the towing direction of thumb force exerted by a magnetic field on the conductor with the flow.