How to determine the direction of the magnetic induction vector
The magnetic field - a force field, which is created by a moving electric charge and acts on it. Power characteristics of the magnetic field is a vector magnetic field. The tasks in physics is often required to determine the direction of the magnetic induction.
You will need:
- magnet; - The magnetic needle; - Gimlet.
Instruction how to define the direction of the magnetic induction vector
Determine the direction of the vector of induction in the field of a permanent magnet. First, locate the north and south poles of the magnet - the north is usually colored blue and marked with Latin letter N, and the southern painted in red and put the letter S. If the paint and marks on the magnet is not, define the pole with a magnetic needle with known poles.
Select the arrow next to the magnet to one end of the arrow was attracted to him. If the magnet was attracted to the south pole of the arrow, then a magnet is the north pole. If, on the contrary, was attracted north, then it corresponds to the magnet south pole. Then use a simple rule, which is that the magnetic field lines (magnetic induction) out of the north pole of the magnet and enter the south.
Determine the direction of the magnetic induction vector in the forward conductor. First connect direct wire to the power supply. Do not forget that for the direction of the current need to take direction from the positive pole of the current source to the negative. Take the right-hand rule (corkscrew), or imagine that hold it in his hand.
Twist the corkscrew motion in the direction of the current in a conductor. Thus the rotation of the handle will indicate the direction of magnetic field lines. Draw the line and build a tangent vector. Vector construction, and will show the direction of the magnetic induction.
Find out where the vector is directed induction coil with current. Also take a corkscrew (gimlet). Set it perpendicular to the plane of the coil. Rotate the gimlet in the direction of the current movement. Translational motion of a corkscrew and determines the direction of the magnetic flux lines in the center of the loop.
Determine the direction of the magnetic field coil and the solenoid (coil conductor wound around the cylindrical surface). Use the right-hand rule. Connect the coil / solenoid to any power source, having received full closed circuit. Right hand position so that four elongated finger pointing direction of the current in the coils.
Lag thumb shows the direction of the magnetic induction inside the solenoid or coil. To use a rule of thumb, if it seemed to you a challenging, hold the magnetic needle to the solenoid or coil. Blue (northern) end of the arrow indicates the direction of the induction vector. Note that the lines of force in the solenoid - direct.