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Each point in this field has a particular strength and a definite direction. The Circle with an arrow direction-pointer indicates the direction of the magnetic fields. The field at the centre of a long circular coil carrying current will be parallel straight lines.
And this time the conductor is given a movement at a right angle to the magnetic field. So are you getting the difference between this setup with the previous one? The previous one dealt with a conductor which is already carrying a current. When it’s placed in a magnetic field at a right angle, then it would result in a deflection or movement in the conductor.
- Here the cause is the current that flows through a straight conductor and the result is the creation of a magnetic field.
- Electric motors are predominantly affected by Fleming’s Left-Hand Rule, while electric generators are primarily affected by Fleming’s Right-Hand Rule.
- Here, we would consider these two forces as negligible.
- The Circle with an arrow direction-pointer indicates the direction of the magnetic fields.
The direction of the magnetic lines of force around the wire is given by right-hand-thumb-rule. So this rule is also known as Maxwell’s right hand thumb rule. Of the circular magnetic field lines can be given by Maxwell’s right-hand grip rule or Right handed corkscrew rule. This rule called ‘Fleming’s Right-hand rule’, helps us to find out the direction of the induced current in the moving conductor placed in a magnetic field that is perpendicular to the direction of the movement of the just mentioned conductor. This rule helps to understand and explain the Generator effect.
So here cause is the movement of a conductor in a magnetic field at a right angle and the result is the generation of current flow through the moving conductor. 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. Right Hand thumb rule Corkscrew rule Suppose we are holding a straight current carrying wire in our right hand.
Or , both the rules predict that magnetic field lines will be in an anticlockwise direction when seen from above. Biot-savart’s law tells that the direction of magnetic field at any point near a current carrying conductor will be perpendicular to the plane containing the conductor and the position vector of the point with respect to the wire. But if you take a straight current carrying wire which passes through a card-board perpendicularly and put some iron dust, the dust will rearrange them in concentric circles. Which shows the lines of force of the magnetic field around a wire are in the form of concentric circles.
More Magnetism Questions
No, it’s because the source of the magnetic field is not a magnetic charge. However, in the case of the electric field, the source of the electric field https://1investing.in/ is an electric charge. Here, in the above diagram of the electric motor, we notice that each side of the loop behaves as a current-carrying conductor.
The direction in which our fingers curl is the direction of the magnetic field. This time the conductor has to be in motion, i.e. the conductor is not static, and it’s moving in the magnetic field. In other words, here cause is the magnetic field already present and the result is observed in the current-carrying conductor.
The next table lists the important differences between Fleming’s left-hand and right-hand rules. Magnetic field, Current through the conductor, and the force experienced by the conductor RESPECTIVELY. Magnetic Field and a conductor (maybe current-carrying or not carrying, may be static or moving) can have different mutual effects in different scenarios, based on some specific conditions.
Fleming’s Left-hand Rule and Fleming’s Right-hand Rule
This rule helps to understand and explain the motor effect. 5, we notice that though forces are in opposite directions, their direction doesn’t change. Also the orange wire is not parallel, and it makes some angle with the magnetic field lines, which is why the loop rotates. 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. 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.
The index finger of the left hand in such a way that they make an angle of 90 degrees and the conductor placed in the magnetic field experiences Magnetic force. In 1820, Oersted showed that a current carrying conductor produces magnetic fields around it. I.e. if you place a compass near a current carrying conductor it will show some deflection. The intensity of magnetic field at any point near a current carrying conductor can be determined by Biot-Savart’s law. B indicates the magnetic field, I indicates the induced current and V indicates the movement of the conductor in the magnetic field. The magnetic effect of electric current can also be easily shown by placing a magnetic compass near a wire which is carrying electric current.
Solved Example on Magnetic Field in a Current-Carrying Conductor
Fleming’s Right hand Rule states that if we stretch the thumb, middle finger, and an index finger in such a way that they are mutually perpendicular to each other. Explain the construction and working of the alternate current generator and also draw the essential diagram. Draw a circuit diagram for the verification of Ohm’s and label it. Hence, our issue was resolved by using a commutator for the smooth rotation of the motor. 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.
We see that the needle of the compass is deflecting, which proves that a magnetic field is produced near the wire. So the generation of the magnetic fields can be credited to a magnet! Now we also know that a magnetic field can also be created by an electric current in a conductor.
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. When we keep a magnetic compass in the field of a magnet , the direction of its needle gives the direction of the net magnetic field due to the bar magnet and the earth’s magnetic field. However, if we keep the compass very close to the magnet, the earth’s field may be neglected. The direction in which the screw rotates is the direction of the magnetic field. Now what we can do is use the commutator and a carbon brush for a complete rotation of the loop without getting the wire distorted.
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. Instead of placing a current-carrying conductor in a magnetic field, we will place just a conductor initially, without any current flowing through it. So just a conductor is what is required to be in the magnetic field and yes, it’s to be placed at a right angle to the direction of the magnetic field present; no need for any battery and switch.
Additionally, in an orange wire, the current is flowing in the right direction while magnetic field B is in the left direction. The flow of current and the magnetic field are in the opposite direction. Electromagnetic Force manifests itself in 2 forms, Electricity, and Magnetism. Electromagnetism is a branch of physics that describes the interactions of electricity and magnetism. A magnetic field is created by moving charges i.e. electric current.
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Danish Physicist H.C. Oersted noted this first in 1820. Generation of an electromotive force in the conductor which results in an induced flow of current through the moving conductor. But in this case, no current needs to flow initially through the conductor.
Use of Fleming’s Right Hand Rule
Again a magnetic field can induce the movement of charges . But one thing we can see in orange wire, the current is flowing in the right direction while magnetic field B is in the left direction. The current and magnetic field is in the opposite direction.
And the result or effect is a force generated which acts on the current-carrying conductor and deflects it. 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. If by passing the current in right hand gripping rule of 10 milliampere in a wire a potential difference of 2.5 volt is produced across the end of wire. Draw the parallel combination circuit diagram and establish the essential formula to calculate equivalent resistance. But these 2 rules are different and applicable in different situations.