Acylindrical shell of surface charge density o and radius r is coaxial with the z axis. find the force per unit length (length along the z-direction) on the right half of the cylinder, where the right half is defined to be -r/2 < < ¢ < +t/2. do this two ways: (a) use the maxwell stress tensor (à la griffiths example 8.2) (b) use the force per unit area on a shell of charge, griffiths equation (2.51): 1 2 f = 2€0 1 2 1 в, в; 1 e, e tij 7dy в? )

You are the coordinator for a program that is going to take place at night in a rectangular amphitheater in the mountains. you will have no access to any electricity, but you must be able to illuminate the entire grounds. you know the intensity of the light from a lantern varies inversely as the square of the distance from the lantern. suppose the intensity is 90 when the distance is 5 m. a. write an equation to model the situation. b. solve for the constant of variation. c. write the equation to model the situation using the constant () of variation. d. you have been given lanterns with 40 light intensity. use your equation to solve for the distance from the lantern. e. you need to illuminate 225 km. how many meters do you need to light? f. how many lanterns will you need?

The smallest particle of an element that retains its identity in a chemical reaction. true or false

Are good conductors of heat also good conductors of electricity? explain your answer.