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? )