The magnetic field with the current thread


This experiment demonstrates a magnetic field with the current thread.

Educational phase: motivation


Required aids+

  • model coil
  • battery
  • metal filings
  • connecting wires
  • switch


Experiment instructions+

E116_S001 Model will engage the thread through the switch to the battery.
E116_S002 Switch closes and we begin to model strewing metal filings. Begin to discover the magnetic induction lines.
E116_S003 After sprinkling the entire model can be observed magnetic field.


Magnetic field lines around the straight wire having the shape of concentric circles. When stočíme direct wire to the ring, there will be a circular thread, whose magnetic field is approximately a magnetic field around a straight wire twisted into the ring.

Experiment video+

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This experiment has been added 14.4.2012 by Jan Krejčí and since then have 8153 visits.
3.6.2014 21:44 © Krejčí Jan