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- University physics volume 2
- Unit 2. electricity and magnetism
- Electromagnetic induction
- Induced electric fields
Summary
- A changing magnetic flux induces an electric field.
- Both the changing magnetic flux and the induced electric field are related to the induced emf from Faraday’s law.
Conceptual questions
Is the work required to accelerate a rod from rest to a speed
v in a magnetic field greater than the final kinetic energy of the rod? Why?
The work is greater than the kinetic energy because it takes energy to counteract the induced emf.
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The copper sheet shown below is partially in a magnetic field. When it is pulled to the right, a resisting force pulls it to the left. Explain. What happen if the sheet is pushed to the left?
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Problems
Calculate the induced electric field in a 50-turn coil with a diameter of 15 cm that is placed in a spatially uniform magnetic field of magnitude 0.50 T so that the face of the coil and the magnetic field are perpendicular. This magnetic field is reduced to zero in 0.10 seconds. Assume that the magnetic field is cylindrically symmetric with respect to the central axis of the coil.
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The magnetic field through a circular loop of radius 10.0 cm varies with time as shown in the accompanying figure. The field is perpendicular to the loop. Assuming cylindrical symmetry with respect to the central axis of the loop, plot the induced electric field in the loop as a function of time.
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The current
I through a long solenoid with
n turns per meter and radius
R is changing with time as given by
dI /
dt . Calculate the induced electric field as a function of distance
r from the central axis of the solenoid.
Inside,
so,
(inside). Outside,
so,
(outside)
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Over a region of radius
R , there is a spatially uniform magnetic field
(See below.) At
,
after which it decreases at a constant rate to zero in 30 s. (a) What is the electric field in the regions where
and
during that 30-s interval? (b) Assume that
. How much work is done by the electric field on a proton that is carried once clock wise around a circular path of radius 5.0 cm? (c) How much work is done by the electric field on a proton that is carried once counterclockwise around a circular path of any radius
? (d) At the instant when
, a proton enters the magnetic field at
A , moving a velocity
as shown. What are the electric and magnetic forces on the proton at that instant?
a.
,
; b.
; c. 0 J; d.
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The magnetic field at all points within the cylindrical region whose cross-section is indicated in the accompanying figure starts at 1.0 T and decreases uniformly to zero in 20 s. What is the electric field (both magnitude and direction) as a function of
r , the distance from the geometric center of the region?
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The current in a long solenoid of radius 3 cm is varied with time at a rate of 2 A/s. A circular loop of wire of radius 5 cm and resistance
surrounds the solenoid. Find the electrical current induced in the loop.
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The current in a long solenoid of radius 3 cm and 20 turns/cm is varied with time at a rate of 2 A/s. Find the electric field at a distance of 4 cm from the center of the solenoid.
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Questions & Answers
distinguish between anatomy and physiology
Anatomy is the study of internal structure of an organism while physiology is the study of the function/relationship of the body organs working together as a system in an organism.
adeyeye
distinguish between anatomy and physiology
regional anatomy is the study of the body regionally
what is the meaning of regional anatomy
epithelial tissue: it covers the Hollow organs and body cavities
in short way what those epithelial tissue mean
in short way what those epithelial tissue mean
Chizoba
What is the function of the skeleton
and body shape/form
Aishat
what is physiology
AminchiSunday
physically is the study of the function of the body
Najaatu
that is what I want ask
YAU
pls what are the main treatment of hiccups
YAU
physiology is the study of the function of the body
Najaatu
hiccups happen when something irritates the nerves that course your diaphragm to contract
Najaatu
how did hypothalamus manege to control all activities of the various hormones
malual
what is protein
Abdulsalam
how can I treat pain a patient feels after eating meals
how do I treat a three year old baby of skin infection?
It depends on the type of infection. Bacterial, fungal, parasitic or viral?
schler
if you can share the sign ad symptoms of the skin infection then u geh the treatment cox they're different sign ad symptoms of skin infection with different treatment
Sa
the sign and symptoms of maleria
Abdulsalam
prostaglandin E2 is the final
mediator.
Lemlem
prostaglandin E2 is the final
mediator of fever.
Lemlem
Discuss the differences between taste and flavor, including how other sensory inputs contribute to our perception of flavor.
taste refers to your understanding of the flavor . while flavor one The other hand is refers to sort of just a blend things.
Faith
While taste primarily relies on our taste buds, flavor involves a complex interplay between taste and aroma
Kamara
which drugs can we use for ulcers
Omeprazole
Cimetidine / Tagament
For the complicated once ulcer - kit
Patrick
what is the function of lymphatic system
to drain extracellular fluid all over the body.
asegid
The lymphatic system plays several crucial roles in the human body, functioning as a key component of the immune system and contributing to the maintenance of fluid balance. Its main functions include:
1. Immune Response: The lymphatic system produces and transports lymphocytes, which are a type of
asegid
to transport fluids fats proteins and lymphocytes to the blood stream as lymph
Adama
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Source:
OpenStax, University physics volume 2. OpenStax CNX. Oct 06, 2016 Download for free at http://cnx.org/content/col12074/1.3
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