03_12_Plates_2

# 03_12_Plates_2 - Today 3/12 o Plates if charge l E-Field l...

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Today 3/12 o Plates if charge l E-Field l Potential l HW: “Plate Potential” Due Friday, 3/14

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σ (+) How big is E? σ (-) E net = 0 0 2 E ε σ = - 0 2 ε σ = + E 0 ε σ = net E E net = 0
σ 0 = Q/A Charged conducting plate What’s wrong with this picture? A = Area of one side

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σ L = σ 0 /2 Charged conducting plate Free charge always goes to surface of conductor. σ R = σ 0 /2
σ L = σ 0 /2 Charged conducting plate σ R = σ 0 /2 What is the electric field inside the conductor? E L = σ L /2 ε 0 = σ 0 /4 ε 0

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σ L = σ 0 /2 Charged conducting plate σ R = σ 0 /2 What is the electric field inside the conductor? E R = σ R /2 ε 0 = σ 0 /4 ε 0
σ L = σ 0 /2 Charged conducting plate σ R = σ 0 /2 What is the electric field inside the conductor? The electric field is zero everywhere inside the conductor. Always, any conductor, no exceptions.

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q=+1C What happens if I let it go?
KE = 0 KE = 100 J A B Assume the particle gains 100 joules of kinetic energy as it moves from A to B. q=+1C

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A B Now I stop it at B.
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