Question

Faraday's experiment: Describe the rate of change of the current in a primary solenoid at different points in a given cycle. What effect would this have had on the magnetic flux passing through the secondary solenoid?

Answer #1

Transformers are simply a pair of coils like those we
see in this experiment. They’re used to transform a source voltage
to a different more desirable voltage. Real transformers usually
have an iron core inside them that focuses the magnetic field in
order to increase the magnetic flux passing
through the secondary. What advantages would be provided by
the iron core and the increased flux?

Faraday's law states that a changing magnetic field will create
an electric field that curls around the magnetic field. To quantify
this, we use the expression of flux (Φ) which is the magnetic field
strength multiplied by the area (A) it’s passing through. This is
given by: Φ = ??
The electric field is applied to the outside edge of this area.
This created an electric potential that is referred to as an
electro-motive force (EMF, ε). Faraday’s law can...

You plan to conduct an experiment to see how magnetic field
varies inside of a solenoid as a function of solenoid length. You
will keep the current through the solenoid and the number of turns
constant, but the number of turns per unit length will change
(imagine a slinky stretched to different lengths). Write a valid
hypothesis for this experiment in the if/then/because format, i.e.
fill in the blanks: If (we perform this
experiment) , then (we expect these
results)...

A)A transformer has a primary with 10 turn and a 120V AC source
connected to it. The secondary has 20 turns. Calculate the voltage
on the secondary
B)A transformer has a primary with 10 turn and a 120V AC source
connected to it. The secondary has 20 turns. Calculate the current
in the secondary
C) A device requires 40W of power to function. Given 120V are
applied to the device, calculate the current through the
device.
D)Calculate the rate of...

You have a solenoid with 570 turns that is 15 cm long and has a
cross-sectional area of 6.5 ??2.
a. (3 pts) Calculate the self-inductance for the solenoid.
b. (4 pts) You now wind a second solenoid around the first solenoid
(so they are both wound around the same core). The second solenoid
does not have the same number of turns as the first. You attach a
power supply to first solenoid and tune the power supply in such...

1. A long solenoid with a diameter of 10 cm has 200 turns/cm. If
the current is decreased at a rate of 3 mA/s, what is the magnitude
of the induced electric field (in mV/m), 6 cm from the axis of the
solenoid?
A. 0.2
B. 0.1
C. 0.3
D. 0.4
2.
A series RL circuit with R = 40 Ω and L = 10 H has a constant
voltage V = 100 V applied at t = 0 by...

3.Explain why if a CD power supply is used, only when the power
supply is turned on or of there is an induced current in the second
coil (secondary).
4. Explain why when the switch is on, and there is a direct
current through the circuit, there is no induced electric current
in that coil.
Electromagnetic Induction
I. Objectives
1. Verify the Faraday-Lenz‘s Law
2. Perform measurements with a set of coils to understand how a
transformer works.
II. Theory
In...

If you pass a current through a wire, you can create a magnetic
field. In this class we examine the field from three specific
configurations: an infinitely-long straight wire, a compact loop of
wire (possibly with multiple turns, a coil), or an infinitely long
solenoid (think of an infinitely-long cylinder of loops made by
wrapping a single wire). See the text for an extended description
of all three geometries.
Here’s the challenge: there are three slightly different formulas
used to...

A 2.10 mHmH toroidal solenoid has an average radius of 5.60 cmcm
and a cross-sectional area of 2.80 cm2cm2.
Part A
How many coils does it have? In calculating the flux, assume
that BB is uniform across a cross section, neglect the variation of
BB with distance from the toroidal axis.
Part B
At what rate must the current through it change so that a
potential difference of 2.80 VV is developed across its ends?
Express your answer in amperes...

Question 27
A. A transformer has an input voltage of 100 V and an output
voltage of 10,000 volts. If the primary coil has 100 turns and the
input current is 2 A, what is the output current, and how many
turns does the secondary coil have?
B. What is the flux through a loop of wire with 20 turns having
a circular shape with a radius of 5.0 cm when it is placed with its
face perpendicular to a...

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