) Calculate the potential of a infinitely long cylinder of radius a which has constant charge density rho. Your answer should be in cylindrical coordinates. b) How does the potential change if a cylinder of radius b < a is hollowed out of the middle so that the axis through their centers coincide. Your answer should be in cylindrical coordinates. 1 of 2 Assignment 4 Phys 9C Due April 29, 2019 c) What is the electric field created in the above scenarios?

i think the answer is a, hope this is right, that would be my best guess.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

b. a lightning bug, plug of grass, and a worm