There is no electric field near a long, straight-thin uniform current-carrying conductor. Therefore, a charged particle moving parallel to the conductor experiences a magnetic force, as per the electrodynamics. The left hand Fleming rule came into existence through John Ambrose Fleming in the 19th Century. It was the simplest approach to understand the direction of the motion or the direction of the electric current. The left-hand rule of Fleming states that when we stretch the forefinger and middle finger of the left hand in a manner that they are mutually perpendicular to each other.
Now, if the forefinger is taken as the direction of the current and the middle finger towards the magnetic field then the thumb points towards the motion of the conductor or the force. It is one of the rules of electricity. The reason being when a current-carrying the conductor comes under the magnetic field there is likely to be a force acting on the conductor. With the help of Fleming's left-hand rule, the director of the force can be determined.
Usage of The Rule
Generally, Fleming's left-hand rule is used for electric motors. On the other hand, for electric generator the right-hand rule is applicable. The reason why the left-hand rule of Fleming is used in the electric motor because in the electric motor there is the presence of magnetic field and electric current which leads to the force that enables creating the motion. This can be referred to as the effect. Hence, the left-hand rule is used. It thus gives us the direction of the force that works on the current if well aware of the magnetic field.
There is a need for different hands for motors and generators because there is a certain amount of difference between the effect and the cause. To elaborate that, the magnetic field and the electric current creates the force which results in motion and that is why the left hand is used. While the motion and the magnetic field exist in the electric generator and they create the current which is why the right hand is used. The physical basis for the rules that are to be remembered is that the electrons flow in the same direction from where they generate a cylindrical magnetic field that encircles around the conductor.
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Gaurav Seth 5 years ago
There is no electric field near a long, straight-thin uniform current-carrying conductor. Therefore, a charged particle moving parallel to the conductor experiences a magnetic force, as per the electrodynamics. The left hand Fleming rule came into existence through John Ambrose Fleming in the 19th Century. It was the simplest approach to understand the direction of the motion or the direction of the electric current. The left-hand rule of Fleming states that when we stretch the forefinger and middle finger of the left hand in a manner that they are mutually perpendicular to each other.
Now, if the forefinger is taken as the direction of the current and the middle finger towards the magnetic field then the thumb points towards the motion of the conductor or the force. It is one of the rules of electricity. The reason being when a current-carrying the conductor comes under the magnetic field there is likely to be a force acting on the conductor. With the help of Fleming's left-hand rule, the director of the force can be determined.
Usage of The Rule
Generally, Fleming's left-hand rule is used for electric motors. On the other hand, for electric generator the right-hand rule is applicable. The reason why the left-hand rule of Fleming is used in the electric motor because in the electric motor there is the presence of magnetic field and electric current which leads to the force that enables creating the motion. This can be referred to as the effect. Hence, the left-hand rule is used. It thus gives us the direction of the force that works on the current if well aware of the magnetic field.
There is a need for different hands for motors and generators because there is a certain amount of difference between the effect and the cause. To elaborate that, the magnetic field and the electric current creates the force which results in motion and that is why the left hand is used. While the motion and the magnetic field exist in the electric generator and they create the current which is why the right hand is used. The physical basis for the rules that are to be remembered is that the electrons flow in the same direction from where they generate a cylindrical magnetic field that encircles around the conductor.
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