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If the index finger points the direction of the magnetic field and the thumb indicates the direction of motion of the conductor, then the middle finger will indicate the direction of the induced current. When a conducting rod is pushed through a powerful magnet, as given in the situation above, we can use Flemings right-hand rule to determine the direction of induced current. To do so, Stretch the thumb, forefinger, and middle finger of the right-hand perpendicular to each other. Suppose the thumb represents the direction of the conductor’s movement, which is upwards. In that case, the forefinger represents the direction of the magnetic field, which is North to South, then the middle finger gives the direction of the induced current, which comes out be towards the right. John Ambrose Fleming introduced two rules to determine the direction of motion or the direction of induced current .

In the late 19th Century, Fleming discovered both Fleming’s Left-hand and Right-hand rule. The Index finger represents the direction of the Magnetic field. The first finger is pointed in the direction of the magnetic field. By convention, it’s the direction from North to South magnetic pole.

  • In an electric generator, the motion and magnetic field exist , and they lead to the creation of the electric current , and so the right-hand rule is used.
  • It’s vital to note that these rules don’t define magnitude; rather, they demonstrate the direction of the three parameters when the other two parameters’ directions are known.
  • The reputation requirement helps protect this question from spam and non-answer activity.
  • So see its the force that depends on the direction of current not the vice versa.
  • So let’s get started… with the article i.e Fleming’s 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 .

The Fore finger represents the direction of the magnetic Field. The Thumb represents the direction of Thrust on the conductor . 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. The Thumb represents the direction of the Motion of the Conductor.

Statement & Definition

Prediction of direction of flux density , given that the current I flows in the direction of the thumb. Note that there is actually an arbitrariness in the definition of velocities and forces. We draw velocities as pointing from where the object was and to where it will be, but we could have chosen the opposite convention and not much would have worked out differently, just some minus signs being shuffled around. Similarly, we could have chosen the opposite convention for forces. An equivalent version of Fleming’s right-hand rule is theleft-hand palm rule. A British engineer, John Ambrose Fleming invented a rule called Fleming’s right-hand rule.

  • Force in the lower orange wire is outwards, and that of the upper orange wire inward wire inwards.
  • If the middle finger of the left hand gives the direction of the current, the forefinger represents the direction of an external magnetic field, then the thumb of our left hand will point in the direction of the force.
  • These rules have nothing to do with the magnitude but only discuss the direction of parameters like Force, current and magnetic field, when the other two components are provided.
  • Prediction of direction of flux density , given that the current I flows in the direction of the thumb.
  • The thumb shows the direction of motion of the conductor in a magnetic field.
  • We know that when a current carrying conductor lays in a magnetic field, a mechanical force applies on the conductor.

Also the orange wire is not parallel, and it makes some angle with the magnetic field lines, which is why the loop rotates. It’s vital to note that these rules don’t define magnitude; rather, they demonstrate the direction of the three parameters when the other two parameters’ directions are known. Electric motors are predominantly affected by Fleming’s Left-Hand Rule, while electric generators are primarily affected by Fleming’s Right-Hand Rule. The current in the external circuit now flows from \(B1\) to \(B2.\) Thus after every half rotation, the polarity of the current in the respective arms changes. Such a current, which changes direction after equal intervals of time, is called an alternating current. The magnetic field $\textbf$ is not a vector, instead it is an anti-symmetric tensor.

Fleming’s right-hand rule

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.e they are mutually perpendicular). 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. The right and left hand are used for generators and motors respectively. The Flemings Right-Hand rule is used to determine the direction of induced current.

Fleming’s left hand rule and right-hand rule were given by British physicist John Ambrose Fleming in the late \(\) century. According to Faraday’s law of electromagnetic induction, When a conductor such as a wire attached to a circuit moves through a magnetic field, an electric current is induced in the wire. Fleming’s right-hand rule gives direction in which the current flows.

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Fleming’s left hand rule

The left-hand rule is used to indicate the direction of motion in an electric motor. The direction of the current will be along the direction of the motion of the alpha particle. According to Fleming’s Left-Hand Rule, the middle finger shows the current direction, the forefinger shows the direction of the magnetic field, and the thumb shows the direction of motion. Applying this rule, the direction of the magnetic field would be upwards. The direction of current will be along with east, i.e. in the direction of motion of proton.

Fleming right-hand rule was originally developed by an English electrical engineer, John Ambrose Fleming, in the late 19th century. It can also be utilized for the determination of the direction of the electron or proton when the magnetic field is applied to it. Fleming’s Left Hand Rule can be used to evaluate the direction of the motion of the conductor placed in the magnetic field. Since the conductor moves along the direction in which the force acts on it, we can also say that the direction in which the thumb points gives the direction of the motion of the conductor. The second finger shows the direction of induced EMF and current. Used to find the direction of induced EMF & Current in eclectic generators.

lorentz force

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. From right hand rule, the magnetic field by the straight wire is directed into the plane of the square loop perpendicularly and its magnetic flux is decreasing.

The decrease in flux is opposed by the current induced in the loop by producing a magnetic field in the same direction as the magnetic field of the wire. Again from right hand rule, for this inward magnetic field, the direction of the induced current in the loop is clockwise. Both Fleming’s left and right-hand rules play a key role in electric motors and generators.

Faraday’s law states that the induced electromotive force in a conductor is directly proportional to the rate of change of the magnetic flux in the conductor. The direction of this induced current can be determined by using Fleming’s right-hand rule. This interaction between current and magnetic fields will produce a physical force. Let’s say the current flowing the conductor is 5 A, length of the rod be 4m and the magnetic field generated by 3 T.

Used to find the direction of motion and current in electric motors. Similarly, when a conductor moves in a magnetic field, EMF and current induce in it. The direction of this induced current can be found using Fleming’s right hand rule.

The direction of this flemings right hand rule defination and current can be defined by Fleming’s right hand rule. Fleming’s left hand rule can be used to find the direction of current in the conductor laying in a magnetic field. 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. The direction of current will be downwards, i.e. opposite to the direction of motion of the electron. Applying Fleming’s left-hand rule, the force experienced by the electron will be along the south. When a current-carrying conductor is kept in a magnetic field, a force applies on it; the direction of this force can be determined using Fleming’s Left-Hand Rule.

Fleming’s left-hand rule tells us that if we stretch our thumb, middle finger and the index finger of our left hand in mutually perpendicular directions to each other, we can see the relation between directions of force , current , and magnetic field . Thus, the conductor placed in the magnetic field experiences a magnetic force in a direction orthogonal both to that field and the direction of the current flow. Scroll down to understand this important concept in detail. The thumb, index finger and middle finger of right hand are stretched out in mutually perpendicular directions (as shown in Figure 4.8).

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The two rings \(R1\) and \(R2\) are connected to the two ends of this coil. The inner side of these rings is made insulated, and these rings \(R1\) and \(R2\) are internally attached to an axle. The axle may be mechanically rotated from outside to rotate the coil inside the magnetic field. The two conducting stationary brushes \(B1\) and \(B2,\) are kept pressed separately on \(R1\) and \(R2,\) respectively. An equivalent version of Fleming’s right-hand rule is the left-hand palm rule. The thumb is pointed in the direction of the motion of the conductor relative to the magnetic field.

The appropriately handed rule can be recalled from the letter “g”, which is in “right” and “generator”. The thumb shows the direction of motion of the conductor in a magnetic field. Different hands need to be used for motors and generators because of the differences between cause and effect. Using this rule, we can determine the direction of this force and the direction of the motor’s motion.

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As we can see the terminals of the battery connected across the split rings are also changing and would help in changing the direction of the current as well. Carbon brushes are just touching the Commutator and are linked with wire, so that if the current reaches the loop via these brushes. In Fig.4, we can see that forces are in opposite directions and the loop starts rotating in a clockwise direction.

Fleming’s left-hand rule for electric motors is one of a pair of visual mnemonics, the other being Fleming’s right-hand rule . 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. A mnemonic that uses the right hand to show the direction of induced current when a conductor moves in a magnetic field.

The rules are called as Fleming’s left hand rule and Fleming’s right hand rule . In an electric motor, the electric current and magnetic field exist , and they lead to the force that creates the motion , and so the left-hand rule is used. In an electric generator, the motion and magnetic field exist , and they lead to the creation of the electric current , and so the right-hand rule is used. In electromagnetism, Fleming’s right-hand rule shows the direction of induced current when a conductor attached to a circuit moves in a magnetic field. It can be used to determine the direction of current in a generator’s windings.

We know that whenever a current-carrying conductor is placed in a magnetic field, a force is experienced by this conductor in a direction that is perpendicular to the direction of the current and the direction of the magnetic field. With the help of Fleming’s left-hand rule, if we know the direction of any two quantities, we can easily determine the direction of the third quantity. So, we learnt that we use Fleming’s left-hand rule for the smooth functioning of electric motors. This reason makes this rule a renowned application of electric devices. Fleming’s left-hand rule is used in the DC motor to find the direction of force or motion of the conductor in the magnetic field. Then the middle finger represents the direction of the induced current within the conductor.

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So see its the force that depends on the direction of current not the vice versa. In other words, there are quantities that are unambiguous and everyone agrees on, like forces and velocities1. The magnetic field is, believe it or not, not one of those. The force produced by a magnetic field is calculated using the right hand rule, which seems arbitrary.

Similarly, if a moving conductor is placed in a magnetic field, an electric current will be induced in it. The direction of the induced current can be determined using Fleming’s Right-Hand Rule. Fleming’s right hand rule helps us determine the induced current direction in a conductor moving perpendicular to a magnetic field. It gives the direction of induced current produced in a straight conductor moving in a magnetic field. When an electric current is passed through a conductor, it generates a cylindrical magnetic field around the conductor. If an external magnetic field is brought close to the current-carrying conductor, the magnetic field and the electromagnetic field interact.

The direction of this force is opposite to the direction of the current and perpendicular to the direction of the magnetic field. Fleming’s hand rules only show the direction of three related parameters i.e. it is not used to find the magnitude of these quantities. Of course, if the mnemonic is taught 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 . The direction of the magnetic field is from north to south.