Hello every body
i want help from you. i have i coil and i want to control the direction of the magnetic field of the coil. can any one help me in that please?
i put a photo of my coils

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http://im12.gulfup.com/2012-03-20/1332193209901.jpg

 

please help me?

 

The direction of the magnetic field depends on the direction in which the current flows. Apply some current to a coil and it will have a magnetic field that you can detect. If it is in the "wrong" direction, reverse the direction of current flow.

 

you are right. i tested that. but i will use a PLC or Micrcontroller to control the direction that why i need the circuit.
i hope you understand me
thank you very much