A Rod of length has a total charge uniformly distributed along its length. The rod lies along the axis with its center at the origin.

a. Find an expression for the electric potential as a function of position along the axis.
b. Show that the result obtained in Part (a) reduces to for Explain why this result is expected

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.