Tip 1: How to determine the direction of magnetic field lines

Any current-carrying conductors moving charged particles, magnets create a magnetic field around. defining the direction of the magnetic lines , you can find out how it will impact on a nearby charged objects.
you need
  • - current source (conductor coil);
  • - right hand;
  • - magnetic needles.
Guide
1
To learn direction of the magnetic lines direct current conductor, position it so that the electric current was in the direction away from you (such as a sheet of paper).Try to remember how to move a drill or screwdriver swirled screw: clockwise and forth.Draw this gesture in order to understand the direction lines .Thus, the magnetic field lines are directed clockwise.Mark them schematically in the drawing.This is called the rule of thumb.
2
If the conductor is in the wrong direction, mentally stand in such a way or rotate the design so that the current is removed from you.Then think of the movement of the drill or screw and put direction of the magnetic lines clockwise.
3
If you right-hand rule seems difficult, try using the right hand rule.To use it to determine the direction of magnetic lines , place your hand, use your right hand with the thumb protruding.Thumb direct the movement of a conductor, and the remaining 4 fingers - in the direction of the induced current.Now notice, the magnetic field lines come into your palm.
4
To use the right-hand rule for coils with a current grasp it mentally palm of the right hand so that the fingers were directed along the current in the coils.See which looks set aside the thumb - this is the direction magnetic lines inside the solenoid.This process will help determine the orientation of the metal blanks, if you need to charge the magnet using the coil current.
5
To determine the direction of the magnetic lines using magnetic needle, place a few of these arrows around the wire or coil.You will find that the axis of the arrow is tangential to the circle.With this method you can find direction lines at every point of space and prove their continuity.

Tip 2: How to determine the direction of the line induction

lines Under understand the induction of the magnetic field lines.In order to obtain information about this type of matter is not enough to know the absolute value of the induction, and the need to know its direction.The direction of the lines of induction can be found with the help of special devices, or use the rules.
How to determine the direction of the line of induction
you need
  • - straight and circular conductor;
  • - DC power supply;
  • - a permanent magnet.
Guide
1
Connect to DC direct wire.If current flows through it, it is surrounded by a magnetic field whose lines of force are concentric circles.Determine the direction of the field lines, using the rule of thumb of the right.Right-hand rule is called a screw to move forward while rotating to the right (clockwise).
2
determine the direction of current in the conductor, given that it flows from the positive to the negative pole of the source.Stem screws arranged parallel to the conductor.Begin to rotate it so that the rod began to move in the direction of the current.In this case, the direction of rotation of the handle shows the direction of the magnetic field lines.
3
find the direction of lines of force induction coil with a current.To do this, use the same rule of thumb right.Gimlet position so that the handle is rotated in the direction of current flow.In this case, the movement of the rod of thumb will indicate the direction of lines of induction.For example, if a current flows in the loop in a clockwise direction, the magnetic induction lines are perpendicular to the plane of the coil, and will go into its plane.
4
If the conductor is moving in an external uniform magnetic field, determine its direction by using the left-hand rule.To do this, place your left hand so that the four fingers show the direction of the current, and set aside the thumb, the direction of the conductor.Then the lines of induction uniform magnetic field will include in the palm of his left hand.
5
find the direction of lines of magnetic induction of the permanent magnet.To do this, determine where its north and south poles.The flux lines are directed from the north to the south pole outside the magnet and from the south pole to the north within the permanent magnet.

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