Question

A simple generator has a square armature 5.0 cm on a side. The armature has 70 turns of 0.59-mm-diameter copper wire and rotates in a 0.700-T magnetic field. The generator is used to power a lightbulb rated at 12.0 V and 25.0 W.

Part A:

At what rate should the generator rotate to provide 12.0 V to the bulb? Consider the resistance of the wire on the armature.

Express your answer to two significant figures and include the appropriate units.

Answer #1

The rotating loop in an AC generator is a square 10.0 cm on a
side. It is rotated at 60.0 Hz in a uniform field of 0.800 T.
Calculate the following quantities as functions of time t,
where t is in seconds.
(a) the flux through the loop
mT·m2
(b) the emf induced in the loop
V
(c) the current induced in the loop for a loop resistance of 2.00
?
A
(d) the power delivered to the loop
W...

The rotating loop in an AC generator is a square 13.0 cm on a
side. It is rotated at 80.0 Hz in a uniform field of 0.800 T.
Calculate the following quantities as functions of time t,
where t is in seconds.
(a) the flux through the loop
mT·m2
(b) the emf induced in the loop
V
(c) the current induced in the loop for a loop resistance of 2.00
Ω
A
(d) the power delivered to the loop
W...

The rotating loop in an AC generator is a square 13.0 cm on a
side. It is rotated at 75.0 Hz in a uniform field of 0.800 T.
Calculate the following quantities as functions of time t,
where t is in seconds.
(a) the flux through the loop
mT·m2
(b) the emf induced in the loop
V
(c) the current induced in the loop for a loop resistance of 2.00
Ω
A
(d) the power delivered to the loop
W...

Faraday's Law III
The armature of a small generator consists of a flat, square
coil with N turns and sides with length L. The coil rotates in a
magnetic field of magnitude B with a constant angular speed
ω.
a) Write an expression for the flux ΦB(t) through the coil as a
function of time. Assume the plane of the coil is perpendicular to
the magnetic field at time t=0. (Your answer should be in terms of
ω, N, B...

We can reasonably model a 40 W incandescent lightbulb as a
sphere 5.0 cm in diameter. Typically, only about 5.0 % of the
energy goes to visible light; the rest goes largely to nonvisible
infrared radiation.
What is the visible light intensity (in W/m2) at the surface of
the bulb? Express your answer in watts per meter squared.
What is the amplitude of the electric field at this surface, for
a sinusoidal wave with this intensity? Express your answer with...

A 15.4 cm -diameter coil consists of 21 turns of circular copper
wire 2.6 mm in diameter. A uniform magnetic field, perpendicular to
the plane of the coil, changes at a rate of 7.02×10−3
T/s .
Determine the current in the loop.
Express your answer using two significant figures.
I =
A
Determine the rate at which thermal energy is produced.
Express your answer using two significant figures.
P =
W

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