Current-carrying wire in a magnetic field

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This experiment demonstrates the Lorentz force acting on the wire suspended in a magnetic field Horseshoe magnet.

Educational phase: motivation

 

Required aids+

  • horseshoe magnet wire in the shape of the frame
  • stand
  • battery
  • connecting wires
  • switch

 

Experiment schema+

 

Experiment instructions+

E123_S002 Conductor current will flow. Closes switch.
E123_S003 If the magnetic north pole down, swing the wire towards the magnet.
E123_S004 We replace the magnet poles.
E123_S005 The wire is deflected in the opposite direction, away from the magnet.
E123_S006 Reversing the current through the wire while leaving the magnet in the same position.
E123_S007 Deflection is to change the current direction is reversed, the swing away from the magnet.
E123_S008 We replace the magnet poles.
E123_S009 The wire is deflected in the opposite direction, away from the magnet.
 

Explanation+

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.
 

Experiment video+

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Physical interpretation+

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.
 
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This experiment has been added 14.4.2012 by Jan Krejčí and since then have 9410 visits.
 
3.6.2014 21:44 © Krejčí Jan
 
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