The corkscrew rule and the right hand
The first to formulate a rule of thumb, was the physicist Peter Gimlet. This rule is very useful if you want to define the magnetic field as the direction of tension.
A rule of thumb, you can use only in the case if the magnetic field is straight in relation to the conductor.
The corkscrew rule States that the orientation of the magnetic field coincides with the orientation of the handle of the gimlet, gimlet if the right thread is screwed in the direction of the current.
The application of this rule is possible in the solenoid. Then the rule of thumb is: a large protruding finger of the right hand indicate the direction of lines of magnetic induction, if you wrap it around the solenoid so that the fingers pointed to the direction of the current in the coils.
A solenoid is a coil of tightly wound coils. Prerequisite - coil length should be significantly larger than the diameter.
Right-hand rule, is opposite to the rule of the gimlet, but with a more user-friendly wording which is used more often.
The right-hand rule sounds like - grasp the investigated element of the right hand so that the fingers of the clenched fist pointing to the direction of the magnetic lines, in this case, when the forward movement in the direction of the magnetic lines of the large bent 90 degrees to the palm, the thumb will indicate the direction of current.
If in the problem described moving the vehicle, the right-hand rule, specify so: position the arm so that the field lines perpendicularly entered the palm, and the thumb extended perpendicular to it, must indicate the direction of motion of conductor, then the remaining four protruding fingers will be aimed in the same way as the induction current.
The left-hand rule
Place the left palm so that four fingers pointing to the direction of electric current in the conductor, while the lines of induction must be in the hand at an angle of 90 degrees, then bent the thumb will indicate the direction of the current on the conductor forces.
Most often this rule is used to determine the direction that will deviate Explorer. This refers to the situation where a conductor placed between two magnets and let it talk.
There is a second formulation of the rule of the left hand. Four fingers of the left hand should be positioned in the direction of motion of positively or negatively charged particles electric current, the lines of induction created by the magnetic field should perpendicularly enter the palm. In this case, the direction of the ampere force or the Lorentz force will point protruding thumb of the left hand.
Advice 2: What is the ampere force
The ampere force is called the force with which the magnetic field acts on a current-carrying conductor placed in it. Its direction can be determined using the left hand rule, and the rule of clockwise.
If in a magnetic field to put metal conductor, then it will be a force from this field, ampere force. The current in the metal is the directional movement of many electrons, each of which acts the Lorentz force. The forces acting on the free electrons have the same magnitude and the same direction. Add up with each other, they give a net force of ampere.
The force got its name after a French physicist and scientist Andre Marie ampere, who in 1820 experimentally studied the effect of magnetic field on current-carrying conductor. Changing the shape of conductors and their location in the magnetic field, Ampere determined the force acting on the parts of the conductor.
Power module ampere proportional to the length of the conductor, the current in it and the module of magnetic field induction. It also depends on the orientation of the conductor in a magnetic field, in other words, from the angle that forms the direction of the current relative to the magnetic field induction vector.
If the induction at all points of the conductor are identical and the magnetic field is homogeneous, then the power module ampere is equal to the product of the current in the conductor, the module of magnetic induction in which it is located, length of the conductor and the sine of the angle between directions of current and magnetic field induction vector. This formula is true for the conductor of any length, as long as it is entirely in a uniform magnetic field.
In order to know the direction of the force of the ampere, you can use the left-hand rule: if you put your left hand so that four fingers indicated the direction of the current, while the field lines would be in the palm of the hand, the direction of the force amp will show bent 90° thumb.
Since the product of the module of magnetic field induction vector of the sine of the angle is a module of the components of the induction vector which is directed perpendicular to the conductor, the orientation of the palm can be determined by this component. Component perpendicular to the surface of the conductor must enter the open palm of his left hand.
To determine the direction of the force of the ampere there is another way, it is called the rule of clockwise. The ampere force is directed in the direction from which the shortest rotation current to the field visible in a counterclockwise direction.
Power amps can be demonstrated on the example of parallel currents. Two parallel wires will repel if the currents in them are in opposite direction to each other, and attracted to, if the directions of the currents are the same.