Electric field of ring of charge a ring shaped charge has a radius of 0.250 meters and bears a total charge of +5.00 c what is the magnitude of the electric field along the axis of symmetry of the ring a distance of 0.500 meters from the center of the ring? ? a. 1.29 × 105 n/c 0 b. 1.67 × 105 n/c o c. 2.59 x 105 n/c ? d. 3.95 × 105 n/c

I) a gas contained within a piston-cylinder assembly undergoes two processes, a and b, between the same end states, 1 and 2, where p1 = 10 bar, v1 = 0.1 m3 , u1 = 400 kj and p2 = 1 bar, v2 = 1.0 m3 , u2 = 200 kj: ' process a: process from 1 to 2 during which the pressure-volume relation is pv = constant. ' process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to state 2. kinetic and potential energy effects can be ignored. for each of the processes a and b, a) sketch the process on a p-v diagram. b) evaluate the work, in kj. c) evaluate the heat transfer, in kj.(ans : qb,12 = -65.0 kj)