Neco GCE 2018 Physics Practical Questions and Answers – Free Expo/ Runz
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Cos @ – |75|65|55|45|35|
Cos @ – |0.2588|0.4226|0.5736|0.7071|0.8192|
See No 2 Graph
Snell’s law is a formula used to describe the relationship between the
angles of incidence and refraction, when referring to light or other waves
passing through a boundary between two different isotropic media, such
as water, glass, or air.
were n is known as refractive index
given refractive index of glass =1.5
i;e a N g =1.5 (from air to glass)
critical angle for glass,C =42degree
i)I Ensured that the pins were vertical
ii)I Avoided parallax error when reading protractor.
S/N – |1|2|3|4|5|
R(n) – |2|3|4|5|6|
V(v) – 2.10|2.30|2.40|2.50|2.60|
CLICK HERE FOR NO.3 GRAPH
i)I ensured that the terminals were firmly tight to prevent partial contact
ii)I avoided parallax error when taking reading from the voltmeter.
i)temperature of wire
ii)cross-sectional area of wire
iii)length of wire
iv)nature of wire
effective E.M.F =2V (parallel connection)
effective internal resistance =rxr/r+r=r/2 n
current I =0.8A
external Resistance R =2n
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DRAW THE GRAPH of V^-1(v^-1) against R^-1
Slope=change inV^-1/Change inR^-1
-I ensured tight connections
-I avoided error due to parallax when reading the voltmetre
-I ensured the key is opened after each reading to prevent the cell from running down
The potential difference between two points in an electric circuit is the work done when a coulomb of charge passes between the points in an electric circuits
where E=e.m.f of the cell
Therefore E=IR Ir=V Ir
V=IR=P.d lost across the external resistance of the cell
Ir=Pd lost across the internal resistance of the cell
E=e.m.f=workdone across external resistance of the cell
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