lec34

lec34 Calendar
Lecture 33. Magnetic Forces on Currents

PHYS 1750: SELECTED TOPICS in PHYSICS
LECTURE 34 and 35. Induction and Maxwell

22.1. Electromotive Force and Induction

1. Electromotive force: electric potential V when no current flows

2. Induction: an emf induced by a changing magnetic flux

3. Magnetic flux Φ = B*A*cos(θ_{B-A_⊥}) Webers

22.2. Faraday's Law

1. Faraday's law: V = − N*ΔΦ/Δt

2. Lenz's law: current opposes change in Φ

22.3. Motion leads to voltage

1. V = B*l*v

2. Applications: railguns, tape recorders

23.1. Maxwell's Equations

1. ∑ ΔA*E_⊥ = Q / ε_o; sum over surface elements of a volume

2. ∑ ΔA*B_⊥ = 0; sum over surface elements of a volume

3. ∑ Δl*E_|| = - ΔΦ_B / Δt; sum over line elements of a loop

4. ∑ Δl*B_|| = μ_oε_o ΔΦ_E / Δt + μ_oI: sum over line elements of a loop

Review Questions
Lecture 36: Electromagnetic Waves

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22.1.	Electromotive Force and Induction
	1.	Electromotive force: electric potential V when no current flows
	2.	Induction: an emf induced by a changing magnetic flux
	3.	Magnetic flux Φ = BA**cos(θ_{B-A_⊥}) Webers
22.2.	Faraday's Law
	1.	Faraday's law: V = − N*ΔΦ/Δt
	2.	Lenz's law: current opposes change in Φ
22.3.	Motion leads to voltage
	1.	V = Blv
	2.	Applications: railguns, tape recorders
23.1.	Maxwell's Equations
	1.	∑ ΔAE*_⊥ = Q / ε_o; sum over surface elements of a volume
	2.	∑ ΔAB*_⊥ = 0; sum over surface elements of a volume
	3.	∑ ΔlE*_\|\| = - ΔΦ_B / Δt; sum over line elements of a loop
	4.	∑ ΔlB*_\|\| = μ_oε_o ΔΦ_E / Δt + μ_oI: sum over line elements of a loop