Flux and Source Strength, Part 2

Collaborate

question

Recall the flux boxes (a), (b), (c), reproduced for you here.
(1.) What is the sign of the source strength R for each case?
(2.) Verify that the sign of the source strength is consistent with the sign of the flux on the left hand side of equation (5).

(a)

(b)

(c)

The figure below shows a cubic Gaussian surface drawn in a river.



The water current flows from left to right, perpendicular to the shaded surfaces A and B. The current enters face A with velocity vA = 0.8 m/s and leaves the face B with velocity vB = 0.5 m/s. Find the rate at which water is absorbed within the cubic Gaussian surface, which has a side length of 10 meters.

When you're through here, move on to our discussion of flux for an electric field.


Copyright 1998-1999 Rensselaer Polytechnic Institute. All Rights Reserved.