Why can't induced EMF in a straight conductor produce a current?

In summary, it is impossible to harness electricity from the induced emf if the velocity of a conductor is parallel to its straight length. This is because the induced emf is the cross product of the velocity and the magnetic field, and if the conductor is moving perpendicular to the field, the emf will be from one side of the wire to the other, causing losses due to resistance.
  • #1
Asad Raza
82
3
I just read in my textbook that it is impossible to harness electricity from the induced emf if the velocity of a conductor is parallel to its straight length. Let me elucidate further: a magnetic field goes into the page and a straight conductor is moved straight down or up (perpendicular to the field). In such a case, the emf will be there, but it can't constitute a current. Why is this so?
 
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  • #2
The induced emf is the cross product of the velocity and the magnetic field. It is perpendicular to both. In your example you are creating an emf, but it is from one side of the wire to the other, not along the wire.
 
  • #3
Got it!
Thanks.
 
  • #4
The induced emf in a conductor can cause currents to flow in circles and not necessarily round a circuit. This causes losses due to the resistance of the conductor.
 

What is EMF and how does it relate to a straight conductor?

EMF stands for electromagnetic force, and it is the force that causes electrically charged particles to move in a conductor. In a straight conductor, EMF is created by the flow of electrons through the conductor.

How is EMF calculated in a straight conductor?

EMF is calculated using the equation E = vBL, where E is the EMF, v is the velocity of the conductor, B is the magnetic field strength, and L is the length of the conductor.

What factors affect the EMF in a straight conductor?

The EMF in a straight conductor is affected by the velocity of the conductor, the strength of the magnetic field, and the length of the conductor. Additionally, the type of material the conductor is made of can also have an impact on the EMF.

How does the direction of the magnetic field affect the EMF in a straight conductor?

The direction of the magnetic field can impact the EMF in a straight conductor. If the magnetic field is parallel to the conductor, no EMF will be induced. However, if the magnetic field is perpendicular to the conductor, the induced EMF will be at its maximum.

What are some real-world applications of EMF in straight conductors?

EMF in straight conductors is used in many everyday devices, such as generators, motors, and transformers. It is also important in the transmission and distribution of electricity in power grids. Additionally, EMF is used in various industries, such as in the production of steel and aluminum.

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