lecture11_capacitors_energy_current_072611

0 1 einside material eif no material were there e

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Unformatted text preview: κ. 0 1 Einside material = Eif no material were there κ E –+ –+ –+ –+ – – – – – – – Physics 142 Summer 2011 Capacitors filled with an insulating material E= E= 1σ κ ε0 +– + +– + +– + +– Q κε 0 A d ∆V = Ed = κε A Q 0 εA C =κ 0 d +– – +– – +– – +– 0 Physics 142 Summer 2011 Dr. Nick Cummings 1 Physics 142 7/26/2011 Dielectrics If nonIf a non-conductor is put between the plates, there is still some polarization reducing the field so the voltage required for a given charge is reduced, i.e., C is increased. The The factor (assuming the space between the plates is filled) is called the dielectric constant, κ. C =κ ε0A d Physics 142 Summer 2011 What’s going on? When When we hook up a battery (or any other electric power source) and a bulb, the b...
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