RQ4-2.

Nuff said?

RQ4-3. The small electric field outside two charged plates (as in problem RQ4-2) is often called the fringe field. (See page 143)

RQ4-4: (See top of page 147) Because the charge is uniformly distributed, the electric field inside is zero, so none of the atoms inside would be distorted, they would all be perfect little round spheres.

RQ4-5: (See page 146) The electric field inside a conducting charged sphere is always zero. Inside a nonconducting sphere, the electric field inside the sphere due to the charges on its surface is zero if the charge is uniformly distributed and there are no outside charges nearby to affect the interior of the sphere..

RQ4-6. The formula is wrong because as x gets large, relative to L, the formula should approach an inverse square law.

RQ4-7 Same answer as number 6.

RQ 4-8. Give an example of an electric field whose magnitude varies with distance as specified:

Independent of distance: In the region between the charged parallel plates of a capacitor.

1/d: A distance x away from a long line (of length L) of charge, where x is "near" the center of the line of charge, and x << L.

1/d² : Outside a charged spherical conductor.

1.d³ : Far from a permenant dipole.

Force that is proportional to 1/d⁵ : Near an induced dipole.