Week8_2 - Faraday's Law of Induction This is generally...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Faraday’s Law of Induction ± This is generally expressed as: an induced emf is produced in the secondary circuit by the changing magnetic field ± The actual existence of the magnetic field is not sufficient to produce the induced emf, the field must be changing
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Magnetic Flux ± To express Faraday’s finding mathematically, the magnetic flux is used ± The flux depends on the magnetic field and the area: B d Φ= BA r r
Background image of page 2
Flux and Induced emf ± An emf is induced in a circuit when the magnetic flux through the surface bounded by the circuit changes with time ± This summarizes Faraday’s experimental results
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Faraday’s Law – Statements ± Faraday’s Law of Induction states that the emf induced in a circuit is equal to the time rate of change of the magnetic flux through the circuit ± Mathematically, B d dt ε Φ =−
Background image of page 4
Faraday’s Law – Statements, cont ± If the circuit consists of N identical and concentric loops, and if the field lines pass through all loops, the induced emf becomes ± The loops are in series, so the emfs in the individual loops add to give the total emf B d N dt ε Φ =−
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Faraday’s Law – Example ± Assume a loop enclosing an area A lies in a uniform magnetic field ± The magnetic flux through the loop is Φ B = B A cos θ ± The induced emf is () cos d BA dt ε θ =− B d Φ =⋅ BA r r
Background image of page 6
A circular loop of wire is held in a uniform magnetic
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 19

Week8_2 - Faraday's Law of Induction This is generally...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online