The rule of the right screw is used in terminology of one of sections of physics studying the electromagnetic phenomena. This rule is applied to definition of the direction of magnetic field.
It is required to you
- The textbook in physics, a pencil, the sheet of paper.
Instruction
1. Read in the textbook in physics of the eighth class how the wording of the rule of the right screw sounds. This rule differently still is called the rule of the gimlet or the rule of the right hand that speaks about its semantic character. So, one of the wording of the rule of the right screw says that to understand how the magnetic field located around the conductor with current is directed, it is necessary to present that forward the movement of some rotating screw coincides with the direction of current in the conductor. The direction of rotation of a screw head in this case has to indicate the direction of magnetic field of the direct conductor with current.
2. Pay attention that the formulation and understanding of this rule become more clear if to present the gimlet instead of the screw. Then the direction of rotation of the handle of the gimlet is accepted to the direction of magnetic field.
3. Remember what is the solenoid. It is known that it is the inductance coil which is reeled up on the magnetic core. The coil is connected to a current source therefore in it uniform magnetic field of a certain direction is formed.
4. Draw on the sheet of paper schematically the solenoid from its face. Actually, you receive the image of a circle. Point to circles, the coil presenting rounds, the direction of current in the conductor in the form of an arrow (clockwise). Now it is necessary to understand in the direction of current where lines of magnetic field are directed. In this case they can be directed either from you, or to you.
5. Present that you twist a certain screw or the screw, rotating it in the direction of the movement of current in the solenoid. Progress of a screw shows the direction of magnetic field in the solenoid. If the direction of current clockwise, then the vector of induction of magnetic field is directed from you.
6. If to you it is inconvenient in each task to apply the abstract rules using the handle of the gimlet or the screw apply the rule of the right screw in the wording of the rule of the right hand. Effect of this rule the same, differs only a way of definition of the direction of induction of magnetic field or current in the coil.
7. Draw once again a solenoid face. Show the direction of current in the coil (counterclockwise). Apply the right edge of the right hand to the drawn circle so that the little finger adjoined to a circle and four fingers indicated the direction of current in conductors. Set aside by 90 degrees a thumb, its direction in your party and coincides with the direction of magnetic field in the solenoid.