Magnet oscilatin in coil


Magnets repelling each other, oscillate in the coil and the induced current.

Educational phase: motivation


Required aids+

  • transparent plastic tube
  • a small rod neodymium magnets
  • coil
  • connecting wires
  • multimeter


Experiment instructions+

E133_S001 Connect the multimeter to the coil.
E133_S002 The hollow coil tube stand upright.
E133_S003 Toss into the tube magnet.
E133_S004 Passing through the magnet coil induces a current that can indicate a multimeter.
E133_S005 Due to the opposite magnetic field coil is expelled from the magnet coil.
E133_S006 Due to gravity, but returned to the coil -> oscillating -> observe a damped oscillation.
E133_S007 The faster the magnet oscillates, the greater the deflection observed.


Connect the voltmeter to the coil and if we move a magnet near the coil, we measure the induced voltage voltmeter. Voltage is positive or negative according to the direction in which moving magnet.

Experiment video+

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Physical interpretation+

Electromagnetic induction is the phenomenon that occurs in non-stationary (unstable, changing) magnetic field. This magnetic field induced in the coil produces an electric field, which characterizes the induced electromotive force. When the coil is connected to power. circuit, it passes through the induced electric. flow. This Act deals with an electric voltage in a closed electrical circuit, which is caused by changing magnetic flux, which is known as electromagnetic induction: changing magnetic field around the coil in the coil induces electric. voltage in a closed circuit through the induced current. The direction of current is dependent on the direction of change of the magnetic field and the orientation of the poles of the magnet towards the coil.
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This experiment has been added 14.4.2012 by Jan Krejčí and since then have 13589 visits.
3.6.2014 21:44 © Krejčí Jan