There are two new equa3ons we need to learn about in this assignment (so that we can usethem in class on Wednesday). No need to derive or prove them – just look up the twoequa3ons in the book and then use them as explained below. If there’s a symbol in theequa3on you’re not sure about, read that part of the book carefully to see what it means.A) Find and report the equa3on for the Electric field due to a long line of charge. The keypart of the book is in sec3on 21.5, example 21.10. Keep in mind that we’re interested inthe limit of a very long (infinitely long) charged wire, where the equa3on looks simpler.B) Use the equa3on from A) to calculate the electric field 2mm radially out from the centerof a long thin charged wire. Assume the wire has a uniform charge of 3nC per meterlength. Make sure you give both the magnitude and the direc3on of the E-field at thispoint, rela3ve to the wire.C) Next, find and report the equa3on for the Electric Field due to a large plate of charge(spread over a large flat area). (Look at the next example, 21.11!) Again, keep in mindthat we’re interested in the limit of a very large (infinite) area, where the equa3on lookssimpler.D) Use the equa3on from C) to calculate the electric field 2mm above a large flat plate.Assume the plate has a uniform charge of -3nC per square meter. Make sure you giveboth the magnitude and the direc3on of the E-field at this point, rela3ve to the plate.

There are two new equa3ons we need to learn about in this assignment (so that we can use
them in class on Wednesday). No need to derive or prove them – just look up the two
equa3ons in the book and then use them as explained below. If there’s a symbol in the
equa3on you’re not sure about, read that part of the book carefully to see what it means.
A) Find and report the equa3on for the Electric field due to a long line of charge. The key
part of the book is in sec3on 21.5, example 21.10. Keep in mind that we’re interested in
the limit of a very long (infinitely long) charged wire, where the equa3on looks simpler.
B) Use the equa3on from A) to calculate the electric field 2mm radially out from the center
of a long thin charged wire. Assume the wire has a uniform charge of 3nC per meter
length. Make sure you give both the magnitude and the direc3on of the E-field at this
point, rela3ve to the wire.
C) Next, find and report the equa3on for the Electric Field due to a large plate of charge
(spread over a large flat area). (Look at the next example, 21.11!) Again, keep in mind
that we’re interested in the limit of a very large (infinite) area, where the equa3on looks
simpler.
D) Use the equa3on from C) to calculate the electric field 2mm above a large flat plate.
Assume the plate has a uniform charge of -3nC per square meter. Make sure you give
both the magnitude and the direc3on of the E-field at this point, rela3ve to the plate.