PHYS 212 Lecture 4: Conductors and Gauss's Law 1/30/17

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byzantiumwhale265

26 Feb 2017

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Electric fields and conductors if an external e-field is applied, these electrons move. Electric field opposite to external field free charges stop moving when their field cancels external in general, for conductor in electrostatic equilibrium, e-field is zero inside the conductor. A +3 nc charge resides within a cavity in a conductor, find the total charge on the cavity surface. Net field inside a conductor must be zero the electric field of a conductor has both parallel and perpendicular components. Parallel components rearrange charges on the surface until an induced field cancels it out. So, the total field must be perpendicular to surface at equilibriumo, the total field must be perpendicular to surface at equilibrium. (cid:1831) = 9 if net charge is inside conductor, it repels to surface. Even if there is an inner cavity, so long as it is empty. Charge density of a conductor is higher near points far away from the center.

Related Questions

Please answer True or False for the following questions:

1.) Gauss' law is useful for calculating the electric field when the charge distribution is highly symmetrical.

2.) At electrostatic equilibrium, the electric field is zero everywhere inside a conductor, and any charge can only be distributed on the surface of the conductor.

3.) Electric field just outside a charged conductor is perpendicular to the surface and has a magnitude $\sigma /2\varepsilon _0$

ceruleanbutterfly285

In a region of space, a uniform electric field points to theleft.

If an uncharged conductor is brought into this region:

a.) A small fraction of the electrons in the conductor willmove:
Choose one: 1. left 2. right 3. will not move or 4 not enoughinfo

and will induce their own electric field that points in whatdirection inside the conductor.:

Choose one: 1. left 2. right 3. it is zero or 4. not enoughinfo

b.) The net electric field in this region of space willpoint:
part A. everywhere inside the conductor:

Choose one: 1. left 2. right 3. it is zero or 4. perpendicularto surface of conductor 5. not enough info

part B. everywhere just outside the conductor:

Choose one: 1. left 2. right 3. it is zero or 4. perpendicularto surface of conductor 5. not enough info

part C. far away from the conductor:
Choose one: 1. left 2. right 3. it is zero or 4. perpendicular tosurface of conductor 5. not enough info

*This conductor will feel a net force due to the external electricfield which is:
Choose one: 1. left 2. right 3. it is zero or 4. not enoughinfo

*If an uncharged insulator was instead brought into this sameexternal electric field:

c.) The insulator will induce its own electric field inside itselfthat points:
Choose one: 1. left 2. right 3. it is zero or 4. not enoughinfo

d.) The net electric field inside the insulator will point:
Choose one: 1. left 2. right 3. it is zero or 4. not enoughinfo

and will be what strength relative to the external electricfield?
Choose one: 1. stronger 2. weaker than 3. same strength as or 4.not enough info

e.) Explain why conductors can do "perfect shielding" whileinsulators can only do "partial shielding".

Explain here:

PHYS 212 Lecture 4: Conductors and Gauss's Law 1/30/17

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