Q1.Nichrome wire has resistivity p=1.5*10° (Q.m) calculate the following a. The resistance per unit length if the radius of wire is 0.321 mm? R-4.6 Ω/m b. If the potential difference of 10 V is maintained across a 10m length of Nichrom wire ,what is the current ? I=2.2A
Q1.Nichrome wire has resistivity p=1.5*10° (Q.m) calculate the following a. The resistance per unit length if the radius of wire is 0.321 mm? R-4.6 Ω/m b. If the potential difference of 10 V is maintained across a 10m length of Nichrom wire ,what is the current ? I=2.2A
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
Transcribed Image Text:HW
Q1.Nichrome wire has resistivity p=1.5*106
(Q.m) calculate the following
a. The resistance per unit length if the radius of
wire is 0.321 mm?
R-4.6 Ωm
b. If the potential difference of 10 V is
maintained across a 10m length of Nichrom
wire ,what is the current ? I=2.2A
Q2Silver wire with cross section area 0.923mm2
, the resistivity = 10.49g/cm and the molar mass
M=107.9g/mol, if the current pass though the
wire is 0.123mA, calculate :
1.The electron density
2.The current density
3.Drift speed (va=1.42*10-3 m/s)
%3D
(n=5.855*1028 e/m')
(j-133.26A/m2 )
Q3.a.Calculate the current density for
Aluminum wire has radius 1mm and current
1mA? 318.31A/m?
b. Calculate the drift speed for electrons in the
wire ? 3.29*108 m/s
if the pAL-2.7*10 kg/m3 and if you know that
one mole in the Aluminum has mass equal to
26.98g and there is one conduction for each
Aluminum atome?
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