Question
In: Physics
If the wire diameter decreases to 1 mm but the length is still 20 m and...
If the wire diameter decreases to 1 mm but the length is still 20 m and still carrying the same 20.0 A current, the drift speed of electrons will (increase / decrease / stay the same), the current density will (increase / decrease / stay the same), the resistivity of the wire will (increase / decrease / stay the same), the resistance of the wire will (increase / decrease / stay the same), the electric field inside the wire will (increase / decrease / stay the same), the voltage across the wire will (increase / decrease / stay the same).
Solutions
genius_generous answered 2 years agoRelated Solutions
What is the resistance of a 2.9-m length of copper wire 1.4 mm in diameter?
What is the resistance of a 2.9-m length of copper wire 1.4 mm in diameter? The resistivity of copper is 1.68×10-8Ω⋅m.
A length of 20-gauge copper wire (of diameter 0.8118 mm) is formed into a circular loop...
A length of 20-gauge copper wire (of diameter 0.8118 mm) is
formed into a circular loop with a radius of 24.0 cm. A magnetic
field perpendicular to the plane of the loop increases from zero to
18.0 mT in 0.20 s. Find the average electrical power dissipated in
the process.
A thin-walled tube with a diameter of 6 mm and length of 20 m is used...
A thin-walled tube with a diameter of 6 mm and length of 20 m is
used to carry exhaust gas from a smoke stack to the laboratory in a
nearby building for analysis. The gas enters the tube at 200°C and
with a mass flow rate of 0.001 kg/s. Autumn winds at a temperature
of 15°C blow directly across the tube at a velocity of 7 m/s.
Assume the thermophysical properties of the exhaust gas are those
of air.
(a)...
A thin-walled tube with a diameter of 6 mm and length of 20 m is used...
A thin-walled tube with a diameter of 6 mm and length of 20 m is
used to carry exhaust gas from a smoke stack to the laboratory in a
nearby building for analysis. The gas enters the tube at 200°C and
with a mass flow rate of 0.005 kg/s. Autumn winds at a temperature
of 15°C blow directly across the tube at a velocity of 5 m/s.
Assume the thermophysical properties of the exhaust gas are those
of air. (a)...
A 6.10 m length of 2.4 mm -diameter wire carries a 770 mA current when 22.0...
A 6.10 m length of 2.4 mm -diameter wire carries a 770 mA
current when 22.0 mV is applied to its ends. The drift velocity is
2.0×10−5 m/s .
A. Determine the resistance R of the wire.
Express your answer to three significant figures and include the
appropriate units.
B. Determine the resistivity ρ.
Express your answer to two significant figures and include the
appropriate units.
C.Determine the current density j.
Express your answer to two significant figures and include...
Suppose a 1-m length of aluminum wire 0.001 m in diameter is held in a horizontal...
Suppose a 1-m length of aluminum wire 0.001 m in diameter is
held in a horizontal east-west position (in vertical equilibrium)
by an external magnetic eld directed north of strength 1 G = 10-4
T. The density aluminum = 2:70 103 kg/m3 and the resistivity
aluminum = 2:65 10?8 m. Also note the volume of a cylinder is Vcyl
= r2h.
(a) Find the resistance RAl of the aluminum wire.
(b) Find the volume VAl of the aluminum wire.
(c)...
A copper wire with diameter of 1,5 mm and length of 4m carries constant current of...
A copper wire with diameter of 1,5 mm and
length of 4m carries constant current of 1.75 A. The free electron
density in the wire is 8,5x1028 m-3. The
resistivity of copper is 1,72x10-8 .m. Calculate
a) current density,
b)drift velocity,
c) magnitude of electric field,
d) potential between the terminals of wire,
e)power dissipated as heat
f) mean free time. (mass of electron: 9,1x10-31kg,
magnitude of charge of electron: 1,6x10-19 C)
A 6.60-m length of 2.1-mm-diameter wire carries a 790 mA current when 24.0 mV is applied...
A 6.60-m length of 2.1-mm-diameter wire carries a 790 mA current
when 24.0 mV is applied to its ends.
a) Determine the resistance RR of the wire.
b) Determine the resistivity ρρ.
c) If the drift speed is 1.9×10−5m/s, determine the
number n of free electrons per unit volume.
A straight rod of solid polymer is of length 1 m and diameter 10 mm. The...
A straight rod of solid polymer is of length 1 m and diameter 10
mm. The polymer is linearly viscoelastic with a tensile creep
compliance given by:
D = 2- exp(-0.1t); Gpa^-1
Where t is in hours. The rod is suspended vertically and a mass
of 10 kg is hung from it for 10 hours. a) Find the change of length
of the rod. b) Identify the time domain of this property test
procedure.
a .25 mm diameter wire .2 m long is to be held at 1035 deg C....
a .25 mm diameter wire .2 m long is to be held at 1035 deg C.
The wires surface is black. how much electrical power is required
to maintain it's temp? The surrounding air and room are both at 20
deg C. The room is also assumed to be black . Find : Raleigh
number, nusselt number, HTC and power required to maintain
temperature.
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