Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wave-induced motion of magnetic spheres   We report an experimental study of the motion of magnetized beads driven by a
travelling wave magnetic field. For sufficiently large wave speed, we report
the existence of a backward motion, in which the sphere can move in the
direction opposite to the driving wave. We show that the transition to this new
state is strongly subcritical and can lead to chaotic motion of the bead. For
some parameters, this counter-propagation of the sphere can be one order of
magnitude faster than the driving wave speed. These results are understood in
the framework of a model based on the interplay among solid friction, air
resistance and magnetic torque.

28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin