1) B. moving a loop of wire through a magnetic field to create an electric current
2) False
3) True
4) False
Explanation:
Faraday Newmann Lenz states that when there is a change in magnetic flux linkage through a coil, an induced electromotive force is induced in the coil, and this induced emf is given by the equation
[tex]\epsilon = -\frac{N\Delta \Phi}{\Delta t}[/tex]
where
N is the number of turns in the coil
[tex]\Delta \Phi[/tex] is the change in magnetic flux through the coil
[tex]\Delta t[/tex] is the time interval
The negative sign in the equation represents Lenz's law, and it indicates the direction of the induced emf.
Now we can analyze each of the questions:
1) which of the following describes electromagnetic induction?
B. moving a loop of wire through a magnetic field to create an electric current
In fact, the magnetic flux through a coil is given by
[tex]\Phi = BA sin \theta[/tex]
where B is the strength of the magnetic field, A the area enclosed by the coil, [tex]\theta[/tex] the angle between the direction of the field and the plane of the coil.
Therefore, if we move the loop of wire in and out from the region with the magnetic field, we are changing the value of A in the formula (the area of the coil which is inside the region of the magnetic field), and so an emf will be induced in the coil, and since the coil is a closed circuit, an electric current will be induced in the coil as well.
2) Faraday's law calculates how many amperes are generated
False
In fact, as we can see from the equation shown previously, Faraday's law allows to calculate the induced electromotive force in the coil: however, the induced emf is a potential different, so it measured in Volts, not in Amperes.
3) Faraday's law calculates voltage
True
As we stated in question 2), Faraday's law allows to calculate the induced emf, which is a potential difference: therefore, a voltage.
4) According to Faraday's law, voltage cannot be changed by changing the magnetic field strength.
False
In fact, as we said previously, the magnetic flux through the coil is
[tex]\Phi = BAsin \theta[/tex]
As we can see, we can change the magnetic flux through the coil by changing either one of these three factors.
Here therefore, the magnetic flux can be changed by changing the strength of the magnetic field, B (and therefore, an emf will be induced in the coil). Therefore, the given statement is false.
Learn more about magnetic fields:
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