What is the idea behind him about Fleming's left hand rule and right hand hand rule?

Answer 1

Fleming's right hand rule (for generators) tells us that if we take our right hand and extend the thumb, and also the index and the middle finger such that they are all at right angles to each other, we can discover the direction of the current induced in the wire of the generator. We'll have to know the direction of the motion of the conductor, and the direction of the magnetic field to do this. *Special note: the direction of the induced current will be the direction of conventional current in this mnemonic. Conventional current is the flow of positive charges in a conductor. We currently know that it is the negative charges - the electrons - that flow when current flows in a wire. But back in the day, theorists modeled the flow of positive charges, or what we call conventional current, and Fleming was an "old school" guy who worked with this conventional current. Let's apply Fleming's right hand rule to discover which way conventional current will flow in a wire in a generator. As stated, we have to know the direction of the motion of the conductor and the direction of the magnetic field. We have our right hand out and the thumb and first two fingers at right angles, each to the other. The thumb will point in the direction of the motion of the conductor. The index finger will point in the direction of the magnetic lines of force. We have motion of the conductor and the direction of the magnetic field. The middle finger will now point in the direction of conventional current flow in this mnemonic. Electron flow will be the opposite of that conventional current, if you are interested. But you knew that. Wikipedia has an article on Fleming's right hand rule, and a link to that post is provided below. The drawings alone are worth the trip over there, and the page is posted free of charge. Why not take advantage of this offer and check it out? It'll be worth it, and you won't get Rick rolled. Promise.

Answer 2

Fleming's 'Left-Hand Rule' applies to motor action(if you are using 'convential current' direction) or to generator action (if you are using 'electron flow' direction), and is attributed to a British academic, John Fleming, who in the late 1900s, devised it to help his students determine the relationship between the direction of magnetic flux, current, and the force on a conductor within a magnetic field.

The thumb, first finger (index finger), and second finger (middle finger) are extended at right-angles to each other. For motor action (conventional flow) the first finger then represents the direction of the magnetic field (north to south), the second finger represents the direction of current (plus to minus), and the second finger represents the direction of the resulting force on the conductor. For generator action (electron flow), the first finger represents the direction of the magnetic field, the thumb indicates the direction of motion of the conductor through the field, and the second finger indicates the direction of the induced voltage in that conductor.

Answer 3

There is no such thing as 'Faraday's Right-Hand Rule'. You may be mixing it up with 'Fleming's Right-Hand Rule' which (for conventional current flow) is used to determine the direction the resulting force will act on a conductor if you know the direction of the current flowing through it, and the direction of the magnetic field in which it is located.

Answer 4

hmm,firstly for the fleming's left hand rule it is mostly to find the force if given the direction of the magnetic field and direction of current!whereas according to fleming's right hand rule it is used to find the current induced in the circuit where field lines are cut!!

Answer 5

according to this rule, stretch the thumb,fore-finger and middle finger of left hand such that they are mutually perpendicular . If the first finger points in the direction the magnetic field, the for finger points in the direction of flow of current, then the thumb points in the direction of motion.

Comment

It should be pointed out that when FL-HR is applied for conventional flow (as above), then it represents motor action, whereas if it is applied for electron flow, it represents generator action.