Faraday's Law and EMF calculation

In summary, Faraday's Law states that a changing magnetic field can induce an electromotive force (EMF) in a closed circuit. This can be calculated using the equation EMF = -N * (ΔΦ/Δt), which is derived from Faraday's Law. Magnetic flux is a measure of the strength of a magnetic field and is represented by the symbol Φ. Faraday's Law is the principle behind how generators work, as they use a rotating magnet to create a changing magnetic field and induce an EMF in a coil of wire. However, Faraday's Law cannot be used to calculate the strength of an electric field, as it only applies to changing magnetic fields. Other equations, such as Coul
  • #1
barendfaber
54
0
Hi,

I found this site with a calculation for EMF: http://www.6pie.com/faradayslaw.php. I just want to see if I have this right.

Magnet Surface: Height (0.05 m) * Width (0.004 m) = Area 0.0002 m2.
Coil windings: 6
Rotations per second: 5
NdFeB Magnet in N42 (1.33 Tesla) (I will reduce this as not all the coil windings will not be right next to the magnet surface)

EMF / V = -N * change in (( tesla * area meters squared)/ seconds)
= -6 * ((0.665 * 0.0002)/.2)
= -6 * 0.000665
= -0.00399

Is the above assumption of possible EMF per rotation correct?
 
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  • #2

FAQ: Faraday's Law and EMF calculation

What is Faraday's Law?

Faraday's Law, also known as the law of electromagnetic induction, states that a changing magnetic field will induce an electromotive force (EMF) in a closed circuit. This means that a changing magnetic field can cause a current to flow in a conductor.

How is EMF calculated?

EMF is calculated using the equation EMF = -N * (ΔΦ/Δt), where N is the number of turns in the coil and ΔΦ/Δt is the change in magnetic flux over time. This equation is derived from Faraday's Law.

What is magnetic flux?

Magnetic flux is a measure of the strength of a magnetic field passing through a surface. It is represented by the symbol Φ and is measured in units of webers (Wb).

How does Faraday's Law relate to generators?

Faraday's Law is the principle behind how generators work. A generator uses a rotating magnet to create a changing magnetic field, which induces an EMF in a coil of wire. This EMF then causes a current to flow, producing electricity.

Can Faraday's Law be used to calculate the strength of an electric field?

No, Faraday's Law only applies to changing magnetic fields and their effects on inducing EMF. To calculate the strength of an electric field, you would need to use other equations, such as Coulomb's Law.

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