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Unformatted text preview: magnitude is proportional to the charge per unit area: E = / . + Q E = 0 E(r) q + + + + + + + tsl59 p.2/3 Charged Conductor at Equilibrium (3) Consider a conductor with a cavity and excess charge Q . Gauss law implies that there is no net charge on the surface of the cavity. The external field is ~ E ( ~ r ) . There is no field in the cavity. Now place a point charge q inside the cavity. Gauss law implies that there is a charge-q on the surface of the cavity. Charge conservation implies that there is a charge Q + q on the outer surface of the conductor. The external field changes to ~ E ( ~ r ) . There is a nonzero electric field field inside the cavity. + Q E = 0 E = 0-q Q+q E = 0 q E (r) E(r) tsl60 p.3/3...
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- Spring '07