Question

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 be expressed as
the following:

? = -ΔΦ/ Δ?

**Q1. Suppose there is a loop with a radius of 10 cm, and
an EMF of 10 V is measured. What is the rate the magnetic field
changed per time?**

**Q2. What would happen if the magnetic field were to
decrease in strength?**

**Q3. What would happen if the magnetic field increases or
decreases, but is pointing in the opposite direction compared to
what is shown?**

Answer #1

Faraday's Law: A bar magnet is pushed through a coil of wire of
cross-sectional area 0.025 m2 as shown in the figure. The coil has
seven (7) turns, and the rate of change of the strength of the
magnetic field in it due to the motion of the bar magnet is 0.065
T/s. What is the magnitude of the induced emf in that coil of
wire?

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...

Answer these three question with use of Faraday's law of
induction:
1-a plane closed loop is placed in a uniform magnetic field, In
what ways can the loop be moved without inducing an emf? consider
motions both of translation and rotation.
2- an air liner is crusing in level flight over alaske, were
earth's magnetic field has a large downward component. which of its
wingtips ( right or left) has more electrons than the other?
3-a copper ring and a...

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...

Please provide a brief overview on:
chapter 21
1. Can I obtain the net electric field due to two or
more point charges?
2. Can I obtain the net Coulomb force on a point charge
due to two or more point charges?
3. Can I draw physical quantities (for example,
velocity, forces or electric fields) involved in a given problem in
a diagram?
4. Do I have a good "qualitative" understanding of the
motion of a charged particle in a...

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