1. The magnetic flux through a loop can change due to a change in which of the f
ID: 3898833 • Letter: 1
Question
1. The magnetic flux through a loop can change due to a change in which of the following (there may be more than one correct answer)?
Check all that apply.
a) the area of the coil
b) the orientation of the loop with respect to a fixed field direction
c) the direction of the field relative to a fixed loop
d) the strength of the magnetic field
2. Identical single loops A and B are oriented so they initially have the maximum amount of flux in a magnetic field. Loop A is then quickly rotated so that its normal is perpendicular to the magnetic field, and in the same time, B is rotated so its normal makes an angle of 45? with the field. How do their induced emfs compare?
a) A's is larger than B's
b) B's is larger than A's
c) they are the same
d) you can't tell the relative emf magnitudes from the data given
3. Increasing only the coil area in an ac generator would result in which of the following?
a) an increase in the frequency of rotation
b) an increase in the maximum induced emf
c) a decrease in the maximum induced emf
d) no change in the generator output
4. In an ac generator, the maximum emf output occurs when the magnetic flux through the coil is
a) not changing.
b) changing most rapidly.
c) at its maximum value.
d) it does not depend on the flux in any way
5. A transformer at the local substation of the delivery system just before your house has
a) more windings in the secondary coil.
b) more windings in the primary coil.
c) the same number of windings in the primary and secondary coils.
6. A transformer located just outside a power plant before the energy is delivered over the wires would have
a) more windings in the secondary coil than in the primary.
b) more windings in the primary coil than in the secondary.
c) the same number of windings in the primary and secondary coils
7. Relative to the blue end of the visible spectrum, the yellow and green regions have
a) longer wavelengths.
b) higher frequencies.
c) shorter wavelengths.
d) both higher frequencies and shorter wavelengths.
8. Which of the following electromagnetic waves travels slowest in a vacuum?
a) green light
b) radiowaves
c) gamma rays
d) infrared light
e) they all have the same speed
Explanation / Answer
1 a b c d
2 a
3 b
4 b
5 b
6 a
7 a
8 e
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