lecture23 - Magnetic Induction Magnetic - m tic flux agne -...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Magnetic Induction Magnetic Induction - magnetic flux - induced emf - Faraday’s Law and Lenz’s Law
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 Magnetic Flux Flux through a surface S: B = Φ S dA B - a scalar ; units, 1 T·m 2 = 1 Weber (Wb) - represents “number of magnetic field lines through a surface S” ( dA is the “area vector”, perpendicular to the surface.)
Background image of page 2
Magnetic Flux Magnetic Flux Flux through a closed surface S: 0 dA B = S This is like Gauss’ law, but for magnetism. However, it states that: - the number of magnetic field lines that enter a volume enclosed by a surface S must equal the number that leave the volume - and it implies that magnetic monopoles do not exist
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: Faraday’s Law: When the external magnetic flux Φ B through a closed conducting loop with one turn changes , the emf induced in the closed loop is: dt d B Φ - = ε (for a loop with N turns: ) dt d N B Φ - = Note that Φ B changes if: 1) B 2) the area of the circuit changes ( dA ) 3) the orientation B•dA ) ( 29 θ cos BA dt d - =
Background image of page 4
Lenz’s Law (the negative sign) Lenz’s Law (the negative sign) (for the direction
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

lecture23 - Magnetic Induction Magnetic - m tic flux agne -...

This preview shows document pages 1 - 6. Sign up to view the full document.

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