The vector of magnetic induction is power characteristic of magnetic field. In laboratory tasks by physics the direction of a vector of induction which is designated on schemes by an arrow and letter B, is defined depending on the available conductor.
It is required to you
- - magnet;
- - magnetic needle.
Instruction
1. If you were given a permanent magnet, find its poles: the North Pole is painted in blue color and noted Latin letter N, southern usually red color with letter S. Graphically represent lines of magnetic field which leave the North Pole of a permanent magnet and enter southern. Construct a vector on a tangent. If there are no marks or paint on poles of a magnet, learn the direction of a vector of induction by means of a magnetic needle which poles are known to you.
2. Establish an arrow near a magnet. One of the ends of an arrow will be attracted to a magnet. If to a magnet the North Pole shooters was attracted, means on a magnet it is the South Pole and vice versa. Use the rule that power lines of magnetic field leave the North Pole of a magnet (not an arrow!) also enter southern.
3. Find the direction of a vector of induction of magnetic field in a round with current by means of the rule of the gimlet. Take the gimlet or a corkscrew and put it perpendicular to the plane of the loaded round. Begin to rotate the gimlet in the direction of the movement of current in a round. Progress of the gimlet will specify the direction of lines of magnetic field in the center of a round.
4. In the presence of the direct conductor collect the complete closed chain, having included in it the conductor. Consider that the movement of current from a positive pole of a source of current to negative is accepted to the direction of current in a chain. Take a corkscrew or present that you hold it in the right hand.
5. Twist the gimlet in the direction of the movement of current in the conductor. The movement of a handle of a corkscrew will show the direction of power lines of the field. Sketch lines on the scheme. Construct to them on a tangent a vector which will show the direction of induction of magnetic field.
6. Learn to what party the induction vector in the coil or the solenoid is sent. Collect a chain, having connected the coil or the solenoid to a current source. Apply the rule of the right hand. Present that you clasped the coil so that four extended fingers show the direction of current in the coil. Then the thumb which is set aside by 90 degrees will specify the direction of a vector of induction of magnetic field in the solenoid or the coil.
7. Use a magnetic needle. Bring closer a magnetic needle to the solenoid. Its blue end (designated by letter N or blue paint) will show the direction of a vector. Do not forget that power lines in the solenoid are straight lines.