BLOCKING READER: DESIGN AND IMPLEMENTATION OF A ...
BLOCKING READER: DESIGN AND IMPLEMENTATION OF A ...
BLOCKING READER: DESIGN AND IMPLEMENTATION OF A ...
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2.3.1 Gauss’s theorem of Electric field<br />
Gauss’s theorem relates the flux trough a closed surface S to the charge enclosed<br />
by that surface [51].<br />
2.4 Magnetic Field<br />
s<br />
13<br />
<br />
φe = E · dA (2.6)<br />
Studies on electromagnetism began after Faraday’s discovery of electromag-<br />
netic induction in the year 1831, a phenomenon that was later theorized by Maxwell<br />
in 1873 with the concept of fields [20]. The utilization of magnetic materials like iron,<br />
hematite, magnetite etc have been done for centuries. We all know about the navi-<br />
gation compass. Gilbert considered earth as a giant magnet to explain the compass.<br />
Magnetic Field is denoted by two vectors magnetic field strength B unit ( A /m)<br />
and magnetic flux density H unit ( W b/ m 2). The flux density and magnetic field<br />
strength are related by permeability of the material(µ) . The relation is shown in the<br />
following equation<br />
and<br />
Where, µ0 = 4π × 10 −7 H/m.<br />
B = µ H (2.7)<br />
µ = µ0µr<br />
(2.8)