Question

A length of copper wire carries a current of 14 A, uniformly
distributed through its cross section. Calculate the energy density
of **(a)** the magnetic field and **(b)**
the electric field at the surface of the wire. The wire diameter is
2.6 mm, and its resistance per unit length is 2.7 Ω/km.

Answer #1

A 2.3 mm -diameter copper wire carries a 38 A current (uniform
across its cross section).
a) Determine the magnetic field at the surface of the wire.
b) Determine the magnetic field inside the wire, 0.50 mm below
the surface.
c)Determine the magnetic field outside the wire 2.5 mm from the
surface.

A 3.3-mm copper wire carries a 16-A current (uniform across its
cross section). Determine the magnetic field
a) at the surface of the wire,
(b) inside the wire, 0.66 mm below the surface,
mT
(c) and outside the wire 3.3 mm from the surface.
mT

An insulated copper wire with a length of 1.2 m carries 20 A of
current. The copper is 1 mm in diameter and the insulation (k=0.13
W/m. ºC) has a thickness of 0.8 cm. The wire has electrical
resistance of 0.0321 Ω. Air at 25 ºC blows in crossflow over the
wire to produce an external convective heat transfer coefficient of
219 W/m2. K. Assuming the copper is isothermal, find the copper
temperature. Take the electrical resistivity of copper to...

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 capital
omega.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 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 copper wire has a square cross section 3.0 mm on a side. The
wire is 3.8 m long and carries a current of 3.5 A. The density of
free electrons is 8.5×1028m−3.
A) Find the magnitude of the electric field in the
wire.
Express your answer in volts per meter.
B) How much time is required for an electron to travel
the length of the wire?
Express your answer in seconds

Consider a straight piece of copper wire of length 2 m and
diameter 8.5 mm that carries a current I = 9 A. There is a magnetic
field of magnitude B directed perpendicular to the wire, and the
magnetic force on the wire is just strong enough to “levitate” the
wire (i.e., the magnetic force on the wire is equal to its weight).
Find B. Hint: The density of copper is 9000 kg/m3 .

Consider a straight piece of copper wire of length 7 m and
diameter 3.5 mm that carries a current I = 5.5 A. There is a
magnetic field of magnitude B directed perpendicular to the wire,
and the magnetic force on the wire is just strong enough to
“levitate” the wire (i.e., the magnetic force on the wire is equal
to its weight). Find B. Hint: The density of copper is 9000
kg/m3 .

A straight wire 6.0 m long carries 28 μC distributed uniformly
over its length.
Part A:
Find the electric field strength 12 cm from the wire axis, not
near either end.
Part B:
Find the electric field strength 460 m from the wire.

A 1.0 m length of copper wire has a cross-sectional area of
0.4x10-6 m2 and carries a current of 50 mA (a
fairly typical amount of current).
What is the current density magnitude in this wire?
What is the electron drift speed in this wire?
How long will It take for an electron to travel the length of
the wire (traveling at the speed you just calculated)?
What is the magnitude of the electric field inside the
wire?

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