How to determine the direction of the magnetic field

The determination of the direction of the magnetic field of the permanent magnetricity in the permanent magnet North and South poles. As a rule, the North pole is colored in blue and South in red. If this is not possible, take a magnetic needle with known poles and set near the poles of a magnet. One of its ends will be drawn to him. If this end of the South pole, then magnetic North and Vice versa, are attracted the North pole is the magnetic South. Then use the rule that the flux lines leave the North pole of a magnet and enter the South pole.

The direction of the magnetic field of a straight conductor and of the coil with tokenpresent will direct the conductor to the current source. Keep in mind that the direction of current is taken direction from the positive pole of the source to the negative. Take the right gimlet (corkscrew) and drive it in the direction of the current. Rotation of the handle will indicate the direction of lines of magnetic induction which surround the conductor in the form of concentric circles.
Connect to the source of the coil of wire. Determine the direction of movement of the current, using the same rule. Then set the drill perpendicular to the coil plane and rotate his arm in the direction of the current. Translational movement of the thumb at the same time (screwed or unscrewed) will show the direction of the flux lines of the magnetic field inside the coil.

Determination of the magnetic field of the coil and solenoids solenoid coils direction of magnetic field is determined by the same methodology. Connect the appliance to the power supply. Position your right hand so that the four fingers show the direction of electric current in the coils. Leave the thumb so that it was perpendicular to the four fingers showing the direction of electric current. He will show the direction of the magnetic field inside the coil or solenoid. It should be noted that the power lines of the magnetic field lines.