A coil of insulated wire is wound many times around an iron bar. The wire is connected to a battery and a contact switch. The contact switch is alternately flipped closed and left closed, so the wire carries a current through it, and then flipped open and left open, so that the current stops. Describe what magnetic fields are created, if those magnetic fields in turn induce an emf, and whether the induced emf is in the direction of the original current or opposite to it. Justify your answer using Lenz's law and the conditions which can cause a magnetic field to induce an emf. You may draw a diagram if it helps you to visualize the apparatus.
Answers
Answer:
As per faraday's law the rate of change in magnetic flux linked with a coil will induce EMF in the coil. It is given by
now here as we are closing the switch and then open it alternatively so it will change the value of current in the coil.
This change in current will change the magnetic flux in the coil due to which it will induce EMF in it.
Now by Lenz the the direction of induce current in the coil will always opposite to the causes due to which it is induced.
As we know that when switch is connected to flow the current the direction of induced current is in opposite to the current so that it will oppose the increasing value of current while when we open the switch the induced current is in direction of the current so that it will increase the value of decreasing current in the loop.
The induced emf is in the direction opposite to the direction of current.
What is induced emf?
Emf is the production of a potential difference in a coil as a result of changes in the magnetic flux passing through it.
When the flux coupling with a conductor or coil changes, electromotive Force, or EMF, is said to be induced.
The rate of change in magnetic flux linked to a coil will induce EMF in the coil, according to Faraday's law.
Now, when we alternately close and open the switch, the current in the coil will change.The magnetic flux in the coil will vary as a result of the change in current, resulting in EMF in the coil.
Now, according to Lenz, the direction of induce current in the coil will always be the polar opposite of the causes.
Hence the induced emf is in the direction opposite to the direction of current.
To learn more about the induced emf, refer to the link;
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Answer:
a
Explanation:
i learned this last week in school.
B. have a different frequency than the resultant wave.
C. be in phase with each other.
D. have a different wavelength than the resultant wave.
Answers
Correct answer choice is:
C. Be in phase with each other.
Explanation:
Components waves mix to produce a resultant with the equivalent wavelength but the amplitude which is bigger than the amplitude of both of the unique component waves, and this results in constructive interference, which states that the interference of two or more waves of identical frequency and phase, constructing in their respective reinforcement and constructing a single amplitude equivalent to the total of the amplitudes of the unique waves.
a. m/s
b. m/s2
c. m2/s
d. kg-m/s2
Answers
That's a speed.
b). m/s² ... (meters per second) per second.
Acceleration.
c). m²/s ... square meters per second.
Rate of change of area.
Meaningless unit, unless you happen to be
a painter of houses or a mower of lawns.
d). kg-m/s² ... (mass) x (an acceleration).
This is a unit of force.
In fact, it's the definition of "newton".
B. study of objects beyond the Earth's atmosphere.
C. Air Force pilot on a naval carrier.
D. daily horoscope.
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So the answer to the question would have to be B.
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5.2 meters in the 1st second
5.2 meters in the 2nd second
5.2 meters in the 3rd second
5.2 meters in the 4th second
.
.
.
.
5.2 meters in the 14th second, and
5.2 meters in the 15th second.
He covers 5.2 meters 15 times in 15 seconds.
To find the total distance, you could write down 5.2 meters
15 times and add them all up. Or you could use the newly-
discovered, labor-saving process called 'multiplication' to do
the same thing. With multiplication, it can be done in one line:
(5.2 m/s) x (15 sec) = 78 meters .
Answers
Answer:
C. 100 ft/min
Explanation:
A scalar quantity has no direction.
A scalar with direction is called a vector.
Answer:
C. 100ft/min
Explanation:
A scalar quantity is a quantity that has a magnitude but no direction, a vector quantity is a quantity that has both a magnitude and a direction. The other three answers are vectors quantities while C. is a scalar.