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

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 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 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.

4. A length of 20-gauge copper wire (of
diameter 0.8118 mm) is formed into a circular loop with a radius of
30.0 cm. A magnetic field perpendicular to the plane of the loop
increases from zero to 13.0 mT in 0.28 s. Find the average
electrical power dissipated in the process.
Answer in W

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 butterfly is perched on a horizontal length of current-carrying
wire.
The wire is oriented at right angles to a uniform magnetic field
that is just strong enough to support the weight of the butterfly
and the wire. The butterfly has a mass of 1.5 g and the wire has a
mass of 5 g and a length of 10 cm. If the magnitude of the current
is 1.6 A directed to the left, what is the magnitude of the...

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

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