Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reconsideration of feasibility of Hall amplifier   In 1955, it was first suggested that Hall effect can be employed for
amplification purposes by using semiconductor material with very high mobility.
While this idea was limited at that time, yet it was not entirely discarded
expecting eventual progress. We revisit this idea and discuss it in the light
of current literature. This manuscript kindles this 65 year old amazing idea
and views it with modern understanding, which will aid in realizing Hall
amplifiers.

4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin