# Wright State University Lake Campus/2016-6/moc/Studyguide

moc20160707T184111

## S_G: Studyguide

1) A circlular capactitor of radius 3.4 m has a gap of 7 mm, and a charge of 95 μC. What is the electric field between the plates?

a) 2.44E+05 N/C (or V/m)
b) 2.95E+05 N/C (or V/m)
c) 3.58E+05 N/C (or V/m)
d) 4.34E+05 N/C (or V/m)
e) 5.25E+05 N/C (or V/m)

2) A circlular capactitor of radius 3.7 m has a gap of 17 mm, and a charge of 80 μC. Compute the surface integral ${\displaystyle c^{-2}\oint {\vec {E}}\cdot d{\vec {A}}}$  over an inner face of the capacitor.

a) 4.67E-11 Vs2m-1
b) 5.65E-11 Vs2m-1
c) 6.85E-11 Vs2m-1
d) 8.30E-11 Vs2m-1
e) 1.01E-10 Vs2m-1

3) A circlular capactitor of radius 3.4 m has a gap of 8 mm, and a charge of 64 μC. The capacitor is discharged through a 9 kΩ resistor. What is the decay time?

a) 3.62E-04 s
b) 4.38E-04 s
c) 5.31E-04 s
d) 6.43E-04 s
e) 7.79E-04 s

4) A circlular capactitor of radius 4.6 m has a gap of 15 mm, and a charge of 57 μC. The capacitor is discharged through a 9 kΩ resistor. What is what is the maximum magnetic field at the edge of the capacitor? (There are two ways to do this; you should know both.)

a) 4.43E-09 Tesla
b) 5.57E-09 Tesla
c) 7.02E-09 Tesla
d) 8.83E-09 Tesla
e) 1.11E-08 Tesla

5) ____ motion is in the usual direction, and _______ is motion that has temporarily reversed itself.

c) indirect; direct
e) direct; elliptical

6) Under what conditions would a planet not seem to rise in the east and set in the west?

a) if the observer is near the north or south poles
b) if the observer is below the equator
c) if the planet is in direct motion
d) if the planet is in elliptical motion
e) if the planet is in retrograde motion

7) When the faster moving Earth overtakes a slower planet outside Earth's orbit

a) tidal forces can be observed on the planet
b) tidal forces can be observed on Earth
d) two of these are true
e) all of these are true

8) Which planet spends more days in a given retrograde?

a) Earth
b) Mars
c) It depends on the season
d) Saturn
e) They are all equal

9) Which planet has more days between two consecutive retrogrades?

a) Saturn
b) They are all equal
c) Mars
d) It depends on the season
e) Earth

10) A planet that is very, very far from the Sun would be in retrograde for approximately ___ months.

a) 6
b) 1
c) 3
d) 24
e) 12

11) If a planet that is very, very far from the Sun begins a retrograde, how many months must pass before it begins the next retrograde?

a) 24
b) 12
c) 6
d) 1
e) 3

12) Planet comes from the Greek word for 'wanderer'.

a) true
b) false

13) We know that Galileo saw Neptune, but is not credited with its discovery because

a) none of these are true
b) it was in a transition between retrograde and direct motion
c) he never published his drawing
d) he thought it was a moon of Saturn
e) it was too faint to be worth drawing

14) How does the density of a Galilean moon depend on its distance from Jupiter?

a) the density of the moons is unknown
b) the most dense moon is neither the closest nor the most distant
c) all the moons have nearly the same density
d) the more dense moon is closer to Jupiter (always)
e) the less dense moon is closer to Jupiter (always)

15) How does the mass of a Galilean moon depend on its distance from the central body?

a) the most massive moon is neither the closest nor the most distant
b) the mass of the moons is unknown
c) the less massive moon is closer to Jupiter (always)
d) the more massive moon is closer to Jupiter (always)
e) all the moons have nearly the same mass

16) Does Jupiter's moon Io have craters?

a) yes, about half from impacts and the others from volcanoes
b) yes, from volcanoes
c) yes, from impacts
d) no, the surface is too new
e) no, the surface is too old

17) The mechanism that heats the cores of the Galilean moons is

a) radioactive decay of heavy elements
c) radiation from the Sun and from Jupiter
d) tides from the other moons and Jupiter
e) tides from Jupiter

18) Immediately after publication of Newton's laws of physics (Principia), it was possible to "calculate" the mass of Jupiter. What important caveat applied to this calculation?

a) tides from the other moons and Jupiter.
b) The different moons yielded vastly different values for the mass of Jupiter.
c) Only the mass of Jupiter relative to that of the Sun could be determined.
d) They needed to wait over a decade for Jupiter to make approximately one revolution around the Sun.
e) The different moons yielded slightly different values for the mass of Jupiter.

19) Ganymede, Europa, and Io have ratios in __________ that are 1:2:4.

a) density
b) rotational period
c) orbital period
d) Argon isotope abundance
e) Two other answers are correct (making this the only true answer).

20) Which of Jupiter's moons has an anhydrous core?

a) Two other answers are correct (making this the only true answer).
b) Europa
c) Ganymede
d) Io
e) Ganymede

21) At 3am a third quarter moon would be}

a) high in eastern sky
b) below the western horizon
c) below the eastern horizon
e) eastern horizon

22) At midnight a waning crescent moon would be}

b) western horizon
c) below the western horizon
d) below the eastern horizon

23) At 9pm a new moon would be}

a) high in western sky
c) western horizon
d) below the eastern horizon
e) below the western horizon

24) At noon a waxing crescent moon would be}

a) eastern horizon
b) high in western sky
e) high in eastern sky

25) At 6pm a waxing crescent moon would be}

c) high in western sky
d) western horizon
e) eastern horizon

26) At 9pm a waning gibbous moon would be}

a) below the western horizon
c) high in eastern sky
d) high in western sky
e) eastern horizon

27) At 9am a third quarter moon would be}

b) high in eastern sky
c) high in western sky
d) below the eastern horizon
e) western horizon

28) At 3am a waxing gibbous moon would be}

a) western horizon
b) below the eastern horizon
d) high in western sky

29) At 6am a waxing crescent moon would be}

a) below the eastern horizon
b) eastern horizon
c) below the western horizon

30) At 9pm a 1st quarter moon would be}

a) high in eastern sky
b) below the western horizon
d) eastern horizon
e) high in western sky

31) At 9pm a full moon would be}

b) below the western horizon
d) eastern horizon
e) high in eastern sky

32) At 9am a new moon would be}

a) high in eastern sky
b) below the western horizon
c) eastern horizon
e) high in western sky

33) H is defined by, B=μ0H, where B is magnetic field. A current of 87A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from the point (0,9.3) to the point (9.3,0).

a) 2.18E+01 amps
b) 2.38E+01 amps
c) 2.61E+01 amps
d) 2.87E+01 amps
e) 3.14E+01 amps

34) H is defined by, B=μ0H, where B is magnetic field. A current of 65A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from the point (-4.9, 4.9) to the point (4.9, 4.9).

a) 1.23E+01 amps
b) 1.35E+01 amps
c) 1.48E+01 amps
d) 1.63E+01 amps
e) 1.78E+01 amps

35) H is defined by, B=μ0H, where B is magnetic field. A current of 50A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from the point (0,7) to the point (7,7).

a) 6.25E+00 amps
b) 6.85E+00 amps
c) 7.51E+00 amps
d) 8.24E+00 amps
e) 9.03E+00 amps

36) H is defined by, B=μ0H, where B is magnetic field. A current of 36A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from (-∞,8.3) to (+,8.3).

a) 1.50E+01 amps
b) 1.64E+01 amps
c) 1.80E+01 amps
d) 1.97E+01 amps
e) 2.16E+01 amps

### S_G (key)

1) A circlular capactitor of radius 4.4 m has a gap of 12 mm, and a charge of 72 μC. What is the electric field between the plates?

-a) 6.21E+04 N/C (or V/m)
-b) 7.52E+04 N/C (or V/m)
-c) 9.11E+04 N/C (or V/m)
-d) 1.10E+05 N/C (or V/m)
+e) 1.34E+05 N/C (or V/m)

2) A circlular capactitor of radius 3.7 m has a gap of 8 mm, and a charge of 34 μC. Compute the surface integral ${\displaystyle c^{-2}\oint {\vec {E}}\cdot d{\vec {A}}}$  over an inner face of the capacitor.

-a) 2.40E-11 Vs2m-1
-b) 2.91E-11 Vs2m-1
-c) 3.53E-11 Vs2m-1
+d) 4.27E-11 Vs2m-1
-e) 5.18E-11 Vs2m-1

3) A circlular capactitor of radius 4.1 m has a gap of 14 mm, and a charge of 71 μC. The capacitor is discharged through a 6 kΩ resistor. What is the decay time?

-a) 1.65E-04 s
+b) 2.00E-04 s
-c) 2.43E-04 s
-d) 2.94E-04 s
-e) 3.56E-04 s

4) A circlular capactitor of radius 4.9 m has a gap of 16 mm, and a charge of 46 μC. The capacitor is discharged through a 9 kΩ resistor. What is what is the maximum magnetic field at the edge of the capacitor? (There are two ways to do this; you should know both.)

+a) 5.00E-09 Tesla
-b) 6.29E-09 Tesla
-c) 7.92E-09 Tesla
-d) 9.97E-09 Tesla
-e) 1.26E-08 Tesla

5) ____ motion is in the usual direction, and _______ is motion that has temporarily reversed itself.

-c) direct; elliptical
-d) indirect; direct

6) Under what conditions would a planet not seem to rise in the east and set in the west?

-a) if the observer is below the equator
-b) if the planet is in elliptical motion
-c) if the planet is in direct motion
+d) if the observer is near the north or south poles
-e) if the planet is in retrograde motion

7) When the faster moving Earth overtakes a slower planet outside Earth's orbit

-a) tidal forces can be observed on the planet
-c) two of these are true
-d) tidal forces can be observed on Earth
-e) all of these are true

8) Which planet spends more days in a given retrograde?

-a) They are all equal
-b) Mars
+c) Saturn
-d) Earth
-e) It depends on the season

9) Which planet has more days between two consecutive retrogrades?

-a) Saturn
-b) They are all equal
-c) Earth
-d) It depends on the season
+e) Mars

10) A planet that is very, very far from the Sun would be in retrograde for approximately ___ months.

-a) 1
+b) 6
-c) 12
-d) 24
-e) 3

11) If a planet that is very, very far from the Sun begins a retrograde, how many months must pass before it begins the next retrograde?

-a) 24
-b) 1
-c) 3
-d) 6
+e) 12

12) Planet comes from the Greek word for 'wanderer'.

+a) true
-b) false

13) We know that Galileo saw Neptune, but is not credited with its discovery because

+a) it was in a transition between retrograde and direct motion
-b) he never published his drawing
-c) he thought it was a moon of Saturn
-d) it was too faint to be worth drawing
-e) none of these are true

14) How does the density of a Galilean moon depend on its distance from Jupiter?

-a) the most dense moon is neither the closest nor the most distant
+b) the more dense moon is closer to Jupiter (always)
-c) the less dense moon is closer to Jupiter (always)
-d) all the moons have nearly the same density
-e) the density of the moons is unknown

15) How does the mass of a Galilean moon depend on its distance from the central body?

-a) the more massive moon is closer to Jupiter (always)
-b) all the moons have nearly the same mass
-c) the less massive moon is closer to Jupiter (always)
-d) the mass of the moons is unknown
+e) the most massive moon is neither the closest nor the most distant

16) Does Jupiter's moon Io have craters?

-a) yes, from impacts
-b) yes, about half from impacts and the others from volcanoes
-c) no, the surface is too old
-d) no, the surface is too new
+e) yes, from volcanoes

17) The mechanism that heats the cores of the Galilean moons is

+a) tides from the other moons and Jupiter
-b) tides from Jupiter
-d) radiation from the Sun and from Jupiter
-e) radioactive decay of heavy elements

18) Immediately after publication of Newton's laws of physics (Principia), it was possible to "calculate" the mass of Jupiter. What important caveat applied to this calculation?

-a) They needed to wait over a decade for Jupiter to make approximately one revolution around the Sun.
+b) Only the mass of Jupiter relative to that of the Sun could be determined.
-c) The different moons yielded vastly different values for the mass of Jupiter.
-d) tides from the other moons and Jupiter.
-e) The different moons yielded slightly different values for the mass of Jupiter.

19) Ganymede, Europa, and Io have ratios in __________ that are 1:2:4.

+a) Two other answers are correct (making this the only true answer).
-b) orbital period
-c) Argon isotope abundance
-d) rotational period
-e) density

20) Which of Jupiter's moons has an anhydrous core?

-a) Ganymede
-b) Europa
-c) Two other answers are correct (making this the only true answer).
+d) Io
-e) Ganymede

21) At 3am a third quarter moon would be}

-a) eastern horizon
-b) below the western horizon
+c) high in eastern sky
-d) below the eastern horizon

22) At midnight a waning crescent moon would be}

+b) below the eastern horizon
-c) below the western horizon
-d) western horizon

23) At 9pm a new moon would be}

-b) high in western sky
+c) below the western horizon
-d) below the eastern horizon
-e) western horizon

24) At noon a waxing crescent moon would be}

+a) high in eastern sky
-c) high in western sky
-d) eastern horizon

25) At 6pm a waxing crescent moon would be}

-a) western horizon
+b) high in western sky
-e) eastern horizon

26) At 9pm a waning gibbous moon would be}

-b) below the western horizon
+c) eastern horizon
-d) high in western sky
-e) high in eastern sky

27) At 9am a third quarter moon would be}

+b) high in western sky
-c) western horizon
-d) high in eastern sky
-e) below the eastern horizon

28) At 3am a waxing gibbous moon would be}

-b) high in western sky
+d) western horizon
-e) below the eastern horizon

29) At 6am a waxing crescent moon would be}

-a) eastern horizon
-d) below the western horizon
+e) below the eastern horizon

30) At 9pm a 1st quarter moon would be}

+a) high in western sky
-b) below the western horizon
-d) high in eastern sky
-e) eastern horizon

31) At 9pm a full moon would be}

+b) high in eastern sky
-c) eastern horizon
-d) below the western horizon

32) At 9am a new moon would be}

-b) below the western horizon
+c) high in eastern sky
-d) eastern horizon
-e) high in western sky

33) H is defined by, B=μ0H, where B is magnetic field. A current of 43A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from the point (0,7.1) to the point (7.1,0).

-a) 8.15E+00 amps
-b) 8.94E+00 amps
-c) 9.80E+00 amps
+d) 1.08E+01 amps
-e) 1.18E+01 amps

34) H is defined by, B=μ0H, where B is magnetic field. A current of 74A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from the point (-5.7, 5.7) to the point (5.7, 5.7).

-a) 1.54E+01 amps
-b) 1.69E+01 amps
+c) 1.85E+01 amps
-d) 2.03E+01 amps
-e) 2.22E+01 amps

35) H is defined by, B=μ0H, where B is magnetic field. A current of 86A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from the point (0,5) to the point (5,5).

-a) 7.44E+00 amps
-b) 8.15E+00 amps
-c) 8.94E+00 amps
-d) 9.80E+00 amps
+e) 1.08E+01 amps

36) H is defined by, B=μ0H, where B is magnetic field. A current of 85A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from (-∞,8) to (+,8).

-a) 2.94E+01 amps
-b) 3.22E+01 amps
-c) 3.53E+01 amps
-d) 3.88E+01 amps
+e) 4.25E+01 amps

### Index: Studyguide to tests

 questions max T1 T2 oldid q_ 1st 1−4 4 1 0 1282320 [1] [2] 5−13 9 2 1 1284510 [3] [4] 14−20 7 1 0 1293955 [5] [6] 21−32 48 0 2 1284517 [7] [8] 33−36 4 0 2 1378627 [9] [10]
1. c24ElectromagneticWaves_displacementCurrent
2. _{A circlular capactitor of radius 4.2 m has a gap of 8 mm, and a charge of 45 μC. What is the electric field between the plates?}
3. AstroApparentRetroMotion
4. _{ ____ motion is in the usual direction, and _______ is motion that has temporarily reversed itself. }
5. AstroGalileanMoons
6. _{How does the density of a Galilean moon depend on its distance from Jupiter? }
10. _{H is defined by, B=μ0H, where B is magnetic field. A current of 48A passes along the z-axis. Use symmetry to find the integral, ${\displaystyle \int {\vec {H}}\cdot {\vec {d\ell }}}$ , from the point (0,6.7) to the point (6.7,0).}