difference between left hand rule and right hand rule pdf

Difference Between Left Hand Rule And Right Hand Rule Pdf

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Fleming's left-hand rule for electric motors is one of a pair of visual mnemonics , the other being Fleming's right-hand rule [1] for generators. They were originated by John Ambrose Fleming , in the late 19th century, as a simple way of working out the direction of motion in an electric motor , or the direction of electric current in an electric generator. When current flows through a conducting wire, and an external magnetic field is applied across that flow, the conducting wire experiences a force perpendicular both to that field and to the direction of the current flow i. A left hand can be held, as shown in the illustration, so as to represent three mutually orthogonal axes on the thumb, fore finger and middle finger.

right-hand rule

Fleming's left-hand rule for electric motors is one of a pair of visual mnemonics , the other being Fleming's right-hand rule [1] for generators. They were originated by John Ambrose Fleming , in the late 19th century, as a simple way of working out the direction of motion in an electric motor , or the direction of electric current in an electric generator. When current flows through a conducting wire, and an external magnetic field is applied across that flow, the conducting wire experiences a force perpendicular both to that field and to the direction of the current flow i.

A left hand can be held, as shown in the illustration, so as to represent three mutually orthogonal axes on the thumb, fore finger and middle finger. Each finger is then assigned to a quantity mechanical force, magnetic field and electric current. The right and left hand are used for generators and motors respectively. Van de Graaff's translation of Fleming's rules is the FBI rule, easily remembered because these are the initials of the Federal Bureau of Investigation.

This uses the conventional symbolic parameters of F for Lorentz force , B for magnetic flux density and I for electric current , and attributing them in that order FBI respectively to the thumb, first finger and second finger.

Of course, if the mnemonic is taught and remembered with a different arrangement of the parameters to the fingers, it could end up as a mnemonic that also reverses the roles of the two hands instead of the standard left hand for motors, right hand for generators. These variants are catalogued more fully on the FBI mnemonics page.

This approach to remembering which finger represents which quantity uses some actions. First of all you need to point your fingers like a pretend gun, with the index finger acting as the barrel of the gun and the thumb acting as the hammer. Then go through the following actions:. Fleming's left-hand rule is used for electric motors , while Fleming's right-hand rule is used for electric generators.

Different hands need to be used for motors and generators because of the differences between cause and effect. In an electric motor, the electric current and magnetic field exist which are the causes , and they lead to the force that creates the motion which is the effect , and so the left-hand rule is used. In an electric generator, the motion and magnetic field exist causes , and they lead to the creation of the electric current effect , and so the right-hand rule is used.

To illustrate why, consider that many types of electric motors can also be used as electric generators. A vehicle powered by such a motor can be accelerated up to high speed by connecting the motor to a fully charged battery. If the motor is then disconnected from the fully charged battery, and connected instead to a completely flat battery, the vehicle will decelerate. The motor will act as a generator and convert the vehicle's kinetic energy back to electrical energy , which is then stored in the battery.

This follows from the second law of thermodynamics the generator current must oppose the motor current, and the stronger current outweighs the other to allow the energy to flow from the more energetic source to the less energetic source. The rule for motors can be recalled by remembering that "motors drive on the left in Britain". The rule for generators can be recalled by remembering that either the letters "g" and "r" is common to both "right" and "generator", or the phrase "Jenny is always right" "genny" being a shortened version of generator.

The direction of the induced magnetic field can be remembered by Maxwell's corkscrew rule. That is, if the conventional current is flowing away from the viewer, the magnetic field runs clockwise round the conductor, in the same direction that a corkscrew would have to turn in order to move away from the viewer.

The direction of the induced magnetic field is also sometimes remembered by the right-hand grip rule , as depicted in the illustration, with the thumb showing the direction of the conventional current, and the fingers showing the direction of the magnetic field. The existence of this magnetic field can be confirmed by placing magnetic compasses at various points round the periphery of an electrical conductor that is carrying a relatively large electric current.

The thumb shows the direction of motion and the index finger shows the field lines and the middle finger shows the direction of induced current. If an external magnetic field is applied horizontally, so that it crosses the flow of electrons in the wire conductor, or in the electron beam , the two magnetic fields will interact. Michael Faraday introduced a visual analogy for this, in the form of imaginary magnetic lines of force : those in the conductor form concentric circles round the conductor; those in the externally applied magnetic field run in parallel lines.

If those on one side of the conductor are running from the north to south magnetic pole in the opposite direction to those surrounding the conductor, they will be deflected so that they pass on the other side the conductor because magnetic lines of force cannot cross or run contrary to each other.

Consequently, there will be a large number of magnetic field lines in a small space on that side of the conductor, and a dearth of them on the original side of the conductor. Since the magnetic field lines of force are no longer straight lines, but curved to run around the electrical conductor, they are under tension like stretched elastic bands , with energy bound up in the magnetic field. Since this energetic field is now mostly unopposed, its build-up or expulsion in one direction creates — in a manner analogous to Newton's third law of motion — a force in the opposite direction.

Since there is only one moveable object in this system the electrical conductor for this force to work upon, the net effect is a physical force working to expel the electrical conductor out of the externally applied magnetic field in the direction opposite to that which the magnetic flux is being redirected to — in this case motors , if the conductor is carrying conventional current upwards , and the external magnetic field is moving away from the viewer, the physical force will work to push the conductor to the left.

This is the reason for torque in an electric motor. The electric motor is then constructed so that the expulsion of the conductor out of the magnetic field causes it be placed inside the next magnetic field, and for this switching to be continued indefinitely. Faraday's law : the induced electromotive force in a conductor is directly proportional to the rate of change of the magnetic flux in the conductor.

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Unsourced material may be challenged and removed. Magnets and Electric Currents, 2nd Edition. London: E. Science mnemonics. Categories : Rules Science mnemonics Electromagnetism Electric motors. Hidden categories: Articles needing additional references from November All articles needing additional references Commons category link is on Wikidata. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file.

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Recieve free updates Via Email! Home Electrical machines Power system Ask a question Contact electricaleasy. Fleming's left hand rule and right hand rule by Kiran Daware Electrical laws. Share: Facebook Twitter Linkedin. If a current carrying conductor placed in a magnetic field, it experiences a force due to the magnetic field. On the other hand, if a conductor moved in a magnetic field, an emf gets induced across the conductor Faraday's law of electromagnetic induction. John Ambrose Fleming introduced two rules to determine the direction of motion in motors or the direction of induced current in generators.

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The Second finger represents the direction of the induced or generated Current the direction of the induced current will be the direction of conventional current; from positive to negative. Fleming's left-hand rule and Fleming's right-hand rule were originated by John Ambrose Fleming, in the late 19th century, as a simple way of working out the direction of motion in an electric motor, or the direction of electric current in an electric generator. When current flows in a wire, and an external magnetic field is applied across that flow, the wire experiences a force perpendicular both to that field and to the direction of the current flow.

When a wire carrying an electric current is moved in a magnetic field of a magnet the magnetic field induced by the wire reacts with the magnetic field of the magnet causing the wire to move outwards. Fleming's left hand rule helps you to predict the movement. F irst finger - direction of magnetic f ield N-S.

Start your free trial today and get unlimited access to America's largest dictionary, with: More than , words that aren't in our free dictionary Expanded definitions, etymologies, and usage notes Advanced search features Ad free! Join Our Free Trial Now! Learn More about right-hand rule Share right-hand rule Post the Definition of right-hand rule to Facebook Share the Definition of right-hand rule on Twitter Dictionary Entries near right-hand rule right-hand regular lock right-hand reverse bevel right-hand reverse lock right-hand rule right-hand screw thread right-handwise right helicoid. Accessed 14 Feb.

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Teaching electricity and magnetism is complicated by the challenge that the magnetic forces are perpendicular to the motion of the particles and currents.

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Foundation Science for Engineers pp Cite as. In the previous topic we saw how electric current produces motion in a magnetic field. In this topic we shall see how motion in a magnetic field induces electric current.

Right hand rule. These convenient appendages help us understand the interaction between electricity and magnetism via the Right Hand Rule and the Left Hand Rule. If you point your thumb in the direction of the current, as shown, and let your fingers assume a curved position, the magnetic field circling around those wires flows in the direction in which your four fingers point. You need to contort your hand in an unnatural position for this rule, illustrated below.


Difference Between Fleming's Left-Hand and Right-Hand Rule. Left-Hand Rule. Right-Hand Rule. It was invented by John Ambrose Fleming. It.


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When using the Right-Hand Rules, it is important to remember that the rules assume charges move in a conventional current the hypthetical flow of positive charges. In order to apply either Right-Hand Rule to a moving negative charge, the velocity v of that charge must be reversed--to represent the analogous conventional current. Because the force exerted on a moving charge by a magnetic field is perpendicular to both the the velocity of the charge and the direction of the field, making illustrations of these interactions involves using the two symbols on the left to denote movement into or out of the plane of the page. Using your right-hand: point your index finger in the direction of the charge's velocity, v , recall conventional current. Point your middle finger in the direction of the magnetic field, B. Your thumb now points in the direction of the magnetic force, F magnetic.

The Second finger represents the direction of the induced or generated Current the direction of the induced current will be the direction of conventional current; from positive to negative. Fleming's left-hand rule and Fleming's right-hand rule were originated by John Ambrose Fleming, in the late 19th century, as a simple way of working out the direction of motion in an electric motor, or the direction of electric current in an electric generator. When current flows in a wire, and an external magnetic field is applied across that flow, the wire experiences a force perpendicular both to that field and to the direction of the current flow. A left hand can be held, as shown in the illustration, so as to represent three mutually orthogonal axes on the thumb, first finger and middle finger.

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