Question

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

Answer #1

Part A:- Faraday's law says that an emf is induced on account of changing magnetic flux through a coil. Since magnetic flux arises from magnetic field, so option (B) is correct.

Part B:- As the north pole enters the ring, magnetic field increases into the ring. Now, according to Lenz's law, a current must be induced to oppose this changing field. Since the original field is increasing into the coil, the induced field due to the current must be in opposite direction, i.e, out of the ring. For this, the current must Counterclockwise, following Right Hand Rule. So, option (A) is correct.

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...

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?

A)According to Faraday’s Law, a changing magnetic field induces
a voltage. One of the things that can be done to increase the
induced voltage is to increase the magnetic field strength. State
at least two other things that can be changed to increase the
induced the voltage.
B)State the electromagnetic spectrum in order from low frequency
to high frequency. Also state, with an arrow the direction of the
electromagnetic spectrum from short wavelength to long
wavelength.

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...

Note: I'm really only struggling with part
c.
Lorentz Law, Ampere's Law, and Faraday's Law
a.) Two equal current carrying infinite wires with current I =
2amps and separation d = 0.5m repel one another. Find the force per
unit lengh (f). Give the relative directions of the currents in the
wires by drawing a diagram.
b.) Find the strength of the magnetic field (B) inside a
solenoid with n= 200 turns/meter (loops per unit length) and
carrying a current...

MY NOTES
Transcranial magnetic stimulation (TMS) is a noninvasive
technique used to stimulate regions of the human brain (see
figure). In TMS, a small coil is placed on the scalp and a brief
burst of current in the coil produces a rapidly changing magnetic
field inside the brain. The induced emf can stimulate neuronal
activity.
(a) One such device generates an upward magnetic field within
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induced...

Using Faraday’s Law equation, answer the following
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A plane circular loop of conducting wire has a radius r = 8m and
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t =5s. If...

Could you draw pictures and explain each answe is correct ( the
correct answer is given for each I just need the explaination)
1. A loop of wire lays flat on a horizontal surface in an area
with uniform magnetic field directed vertically down. Magnetic
field suddenly grows stronger. While magnetic field is changing,
the induced current in the loop as viewed from above is (:correct
answer is Counterclockwise )
2. A wire with a constant in time current I is...

A circular loop of wire with area 0.020 m2m2 lies in the
x-y plane. Initially there's a magnetic field of 3.6 TT in
the -z-direction. The field remains constant for 11 ss ,
then decreases gradually to zero in 11 ss , and then remains zero
for 11 ss .
Part A: Find the magnitude of the induced emf in the loop for
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Express your answer to two significant figures and include the
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A TMS (transcranial magnetic stimulation) device creates very
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Part A- What emf is induced in the ring as the field changes?
Express your answer with the appropriate units.
Part B- If the band is made of...

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