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Lec06-22009

# Lec06-22009 - Lecture 6-1 Lecture Thin sheet of any charge...

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Lecture 6 Lecture 6 -1 Thin sheet of any charge distribution ' R disk EE E + =+ u ru r u r ' Ld i s k E ur Just to left of disk Just to right of disk \$ \$ 00 0 (' ) ) 22 disk disk disk disk E n n σσ εε σ ε + +− Δ= + −+ =− ⎛⎞ ⎜⎟ ⎝⎠ = u r u r tiny disk 0 n E Δ =

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Lecture 6 Lecture 6 -2 Charges and fields of a conductor In electrostatic equilibrium, charges inside a conductor do not move. Thus, E = 0 everywhere in the interior of a conductor . Since E = 0 inside, there are no net charges anywhere in the interior. Net charges can only be on the surface(s). The electric field must be perpendicular to the surface just outside a conductor, since, otherwise, there would be currents flowing along the surface. σ 0 ε
Lecture 6 Lecture 6 -3 Electrostatic Shielding (Continued) + + + + + + Add Q’ If you now add charge Q’ to the conductor and/or Q’’ on the outside of the conductor, the interior electric fields do not change. Q’’ If you move charge q in the cavity, the exterior electric fields and the extreior charge distribution are not affected. Conducting shell electrostatically shields its exterior from changes on the inside. q Conducting shell electrostatically shields its interior from changes on the outside, too.

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Lecture 6 Lecture 6 -4 READING QUIZ 1 IN WHAT DIRECTION CAN YOU MOVE A TEST CHARGE RELATIVE TO AN ELECTRIC FIELD SO THAT THE ELECTRIC POTENTIAL DOES NOT CHANGE? A| Move in the direction of the electric field lines. B| Move opposite to the direction of the electric field lines. C| Move from point A in the electric field to point B in in the electric field along an arbitrary path. D| Move relative to the electric field along a path which is everywhere perpendicular to the electric field.
Lecture 6 Lecture 6 -5 Electric Potential Energy of a Charge in Electric Field • Coulomb force is conservative => Work done by the Coulomb force is path independent .

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Lec06-22009 - Lecture 6-1 Lecture Thin sheet of any charge...

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