Select the correct answer(s): When considering electromagnetic induction, TrueFa
ID: 2278605 • Letter: S
Question
Select the correct answer(s): When considering electromagnetic induction,TrueFalse Electric current can be induced by a changing magnetic field.
TrueFalse Lenz's Law determines the magnitude of the emf induced across the ends of a coil of wire that is rotating in a magnetic field.
TrueFalse Faraday's Law can be used to calculate the magnitude of an induced emf.
TrueFalse The smaller the change in magnetic flux, the greater the induced emf.
A house has a floor area of 104.0 m2 and an outside wall that has an area of 26.00 m2. The earth's magnetic field here has a horizontal component of 2.510E-5 T that points due north and a vertical component of 4.170E-5 T that points straight down, toward the earth. Determine the magnetic flux through the wall if the wall faces north.
A house has a floor area of 104.0 m2 and an outside wall that has an area of 26.00 m2. The earth's magnetic field here has a horizontal component of 2.510E-5 T that points due north and a vertical component of 4.170E-5 T that points straight down, toward the earth. Determine the magnetic flux through the wall if the wall faces north.
Explanation / Answer
A)
True Electric current can be induced by a changing magnetic field
B)
False Lenz's Law determines the magnitude of the emf induced across the ends of a coil of wire that is rotating in a magnetic field.
C)
True Faraday's Law can be used to calculate the magnitude of an induced emf.
D)
False The smaller the change in magnetic flux, the greater the induced emf.
E)
the field penetrates the wall with a zero angle between the "area vector" and the magnetic field
cos(theta) = 1.0,
the flux is therefore just Bh*(wall area),
where Bh is the horizontal component of the magnetic field.
so
=2.510 x10^-5 * 26
=6.52 x 10^-4 T-m^2
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