Question

Faraday’s law indicates that the induced emf and the change in flux have opposite algebraic signs. Does this mean that the direction of induced magnetic field is always opposite to original magnetic field direction? Why yes or why not?

Answer #1

Faraday's law states that the induced emf is proportional to the change in flux linkage and the emf induced will oppose the change. Hence, when flux linkage increases, emf will be induced such that the flux linkage is reduced and if flux linkage decreases, emf will be induced such that flux linkage is increased.

To increase the flux linkage, induced magnetic field will be in the same direction of original magnetic field and to decrease the flux linkage, induced magnetic field will be opposite to the direction of original magnetic field. Therefore, induced magnetic field is not always opposite to the original magnetic field, but it depends on the direction of change in flux linkage.

Which of the following is/are TRUE?
a. Faraday’s law of electromagnetic induction states that the
induced emf or current in a circuit is directly proportional to the
time rate of change of the magnetic flux in the circuit
b. There is induced emf or current in a circuit of the magnetic
field in the circuit is very high
c. There is induced emf or current in a circuit if the area of
the circuit is not too big
d. There...

Part A. According to Faraday’s Law, an emf can be formed by
A. a changing electric field
B. a changing magnetic field
C. a constant electric field
D. a constant magnetic field
I think it might be B, idk.
Part B. You are facing a copper ring and insert a magnetic,
north first, into the ring. Which direction is the induced current
in the ring.
A. Counterclockwise
B. Clockwise

Using Faraday’s Law equation, answer the following
mathematical questions.
A plane circular loop of conducting wire has a radius r = 8m and
N = 4 turns. It is located in a uniform magnetic field. The
magnetic field’s direction makes a 75° angle with respect to the
normal of the loop. The magnitude of magnetic field B increases at
a constant rate from B1 = 3.2 T to B2 = 4.7 T in a time interval of
t =5s. If...

For Faraday and Lenz's Law:
Did an increasing magnetic flux generate any current in the
coil? decreasing flux?
Did the induced magnetic field always oppose the change in
flux?

A conducting loop has a magnetic flux through it. If the loop is
rotated will the flux through the loop change?
Yes, if the rotation axis is not parallel to the magnetic
field
Only of the rotation axis is parallel to the magnetic field
Yes, for any rotation axis
Not enough information
2. A bar magnet is held stationary inside a coil of wire that is
connected to a meter. What can be said about the current in the
coil?...

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...

Why should the induced emf have the same order as the order of
the magnetic field when measuring the sensitivity of a
voltmeter?

So I have a magnet that goes through a metal coil, north
entering first, then exits through the other side of the coil. The
induced current changes direction half way as the magnet is passing
through the coil. So the question is:
Why does the induced current change direction when the magnet is
halfway going through a coil? Be very specific when answering this
one. (Address what is happening to the magnetic flux and the
direction of the induced magnetic...

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...

A 310 turn solenoid with a length of 23.0 cm and a radius of
1.60 cm carries a current of 1.85 A. A second coil of four turns is
wrapped tightly around this solenoid, so it can be considered to
have the same radius as the solenoid. The current in the 310 turn
solenoid increases steadily to 5.00 A in 0.900 s.
(a) Use Ampere's law to calculate the initial magnetic field in
the middle of the 310 turn solenoid....

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