Question

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/m^{3} .

Answer #1

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)

Copper has 8.5 x10^28 electrons per m^3 . A 71 cm length of
copper wire of diameter 2.05 mm carries 4.85A of current. ( For
copper: ρ = 1.72 x 10^-8 ohm-m) a. How much time does it take an
electron to travel the length of the wire ? b. Find the electric
field inside the wire. c. What is the resistance of this wire?

A long copper wire carries a 6.0-A current in a uniform magnetic
field that is applied perpendicular to the 3.0-m segment of the
wire, the magnetic force on the segment is 0.36 N. (a) What is the
magnitude of the magnetic field? (b) If the segment of wire has a
mass of 0.050 kg, and is kept in the same magnetic field as part
(a). What minimum current in the wire is needed in order for the
magnetic force to...

A wire carries a current from west to east. Assume that at this
location the magnetic field of Earth is horizontal and directed
from south to north and that it has a magnitude of 4.92 ✕
10−5 T. What current would make the magnetic force equal
in magnitude to the gravitational force? The wire is made of copper
and has a cross-sectional area of 2.45 ✕ 10−6
m2. The density of copper is 8.92 ✕ 103
kg/m3. (Give the magnitude...

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 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

A 29 cm diameter coil consists of 22 turns of cylindrical copper
wire 2.6 mm in diameter. A uniform magnetic field, perpendicular to
the plane of the coil, changes at a rate of 7.00

One long straight wire is to be held directly above another
(both parallel to the ground and to each other) by repulsion
between their currents. The lower wire carries 190 A and the wire
8.50 cm above it is 13-gauge (1.829 mm diameter) copper wire. (The
density of copper is 8.80 ✕ 103 kg/m3.)
(a) What current (in A) must flow in the upper wire, neglecting
the Earth's field?
(b) What is the smallest current (in A) if the Earth's...

A 26.0 cm diameter coil consists of 24 turns of cylindrical
copper wire 2.40 mm in diameter. A uniform magnetic field,
perpendicular to the plane of the coil, changes at a rate of
6.50e-3 T/s. Determine the current in the loop in milli-amps (the
resistivity for copper is 1.72e-8Ω.m).
answer in mA

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