Page 427 - SEC_2017WorkingDocument_Neat

MO CAPE CAPE 2018 U2 How the SO can be clarified? Status in
DU 2018 SO which final syllabus
LE SO # needs to be
# more clearly
stated

1 4.1 define define capacitance and the ‘farad’ Not Changed
capacitance; to suggested

1 4.3 use the formula use the formulae C= εA/d ; ε = εr Not Changed
C= εA/d ; ε0 to suggested
ε = (absolute) permittivity of a
Refer to the use medium, εr = relative permittivity
of dielectrics to of a medium or dielectric
produce constant, ε0 = permittivity of free
capacitors of space or a vacuum
larger values εr of air ≈ a vacuum ≈1,
with the same εr of polystyrene ≈3,
dimensions. εr of water = 80 [polar molecule]
Mention the
types of
dielectrics and
the range of
their dielectric
constants or
relative
permitivity.
1 7.1 explain explain magnetic flux and the Not Changed
magnetic flux ‘weber’ to suggested
2 2.1 describe the The statement “describe the Not Changed
electrical electrical properties of to suggested
properties of semiconductors” is very vague.
semiconductors;
The population Explain what a semiconductor
density of holes is.
and electron in [this came in 2017]
intrinsic and
doped There are no “typical” values.
semiconductors Every book and internet table has
should be different values, so the Syllabus
mentioned and should give specific values as
compared with shown below.
that for
conductors. Compare the population density
Resistivity of [or charge density] of electrons
semiconductors in conductors, holes and electron
should be in intrinsic and doped [extrinsic]
compared to that semiconductors

82