Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stress due to Electric and Magnetic fields in Viscoelastic Fluids   A clear understanding of body force densities due to external electromagnetic
fields is necessary to study flow and deformation of materials exposed to the
fields. In this paper, we derive an expression for stress in continua with
viscous and elastic properties in presence of external, static electric or
magnetic fluids. Our derivation follows from fundamental thermodynamic
principles. We demonstrate the soundness of our results by showing that they
reduce to known expressions for Newtonian fluids and elastic solids. We point
out the extra care to be taken while applying these techniques to permanently
polarized or magnetized materials and derive an expression for stress in a
ferro-fluid. Lastly, we derive expressions for ponderomotive forces in several
situations of interest to fluid dynamics and rheology.

1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat