PHY242 Test 1
Electrostatics and Thermodynamics Quiz
Test your knowledge of electrostatics and thermodynamics with our challenging quiz! Featuring 27 questions, this quiz covers a range of topics from charging by induction to the behavior of gases in different thermodynamic processes.
Get ready to explore:
- Electrostatic forces
- Thermal properties and changes
- Gas laws and processes
- Practical applications of physics concepts
In the figure, two uncharged conducting spheres of identical mass are suspended from the ceiling by two nonconducting strings. Assume that the vertical strings make a right angle with the ceiling initially such that θ1 = θ2 = 90°. The spheres are then given charges q1 = Q and q2 = 3Q. After this charging occurs, which of the angles that the strings make with the ceiling is larger?
θ1
θ2
They are the same
Now suppose that the two charged conducting spheres are brought together and made to touch before being released. Now which of the angles that the strings make with the ceiling is larger?
θ1
θ2
They are the same
Rod A is a positively charged insulator. Rod B is in contact with Bob C. Rod B and Bob C are initially neutral and made of conducting material. Rod B is fixed while Bob C is free to swing. What happens when Rod A is brought close to Rod B (but does not touch)?
Rod B will acquire a net negative charge across its surface while Bob C will acquire a net positive charge. The bob will remain still.
Rod B will acquire a net positive charge across its surface while Bob C will acquire a net negative charge. The bob will remain still.
Rod B and Bob C will both acquire a net negative charge. Because Rod B and Bob C are like charges, the will repel each other and the bob will swing.
Rod B and Bob C will both acquire a net positive charge. Because Rod B and Bob C are like charges, the will repel each other and the bob will swing.
Select the configuration which would result in a net zero electric force on q.
0%
0
0%
0
0%
0
0%
0
Based on the image of three charges in an electric field, the sign of the charge of q1 is...
Positive
Negative
Neutral
Based on the image of three charges in an electric field, the sign of the charge of q2 is...
Positive
Negative
Neutral
Based on the image of three charges in an electric field, the sign of the charge of q3 is...
Positive
Negative
Neutral
Based on the scenario depicted below of charging by induction, the final charge on the sphere is...
Positive
Negative
Neutral
Based on the scenario depicted below of charging by induction, the final charge on the rod is...
Positive
Negative
Neutral
Select the statement which is FALSE about when two objects of different temperature come into contact with one another
Heat flows from the hotter object to the colder object
The objects come to thermal equilibrium with one another
Heat flows from the colder object to the hotter object
Consider a steel bar. Which of the following changes in temperature will produce the largest increase in the length of the bar?
15 to 30 degrees Celsius
20 to 30 Kelvins
45 to 65 degrees Celsius
50 to 55 Kelvins
Consider a flat metal ring at uniform temperature. If it is heated uniformly to a warmer temperature, select the 2 true statements about its change in shape.
The hole in the center expands, but the outer edge contracts
The hole in the center and the outer edge both contract
The hole in the center contracts, but the outer edge expands
The hole in the center and the outer edge both expand
Which of the following statements is true about what happens to the energy during melting processes?
It goes exclusively toward changing the phase of the substance
It goes toward increasing the temperature
It goes toward decreasing the temperature
Six points have been labeled A through F on the PT diagram of a substance in the figure below. If the pressure and temperature of the substance are represented by point A, which of the following things could you do to cause the substance to change phase to a gas?
Raise the pressure
Lower the pressure
Lower the temperature
Six points have been labeled A through F on the PT diagram. If the pressure and temperature of the substance are represented by point D, which of the following things could you do to cause the substance to change phase to a solid?
Raise the pressure
Lower the pressure
Lower the temperature
Suppose a piece of metal and a piece of wood are allowed to sit out on a table until they come to thermal equilibrium with the table. When you touch the piece of wood and piece of metal simultaneously, the metal feels colder than the wood. This happens because of a difference in which thermal property of the two materials?
Conductivity
Temperature
Metallicity
An ideal gas begins in state A. The gas then undergoes one of the following three processes. At the end of that process, there is no change in the internal energy of the gas. Which type of process occurred?
Isochoric
Adiabatic
Isothermal
Isobaric
Which of the following is a characteristic of an adiabatic process?
Delta T = 0
Q = 0
Delta V = 0
Delta P = 0
Which of the following is a characteristic of an isobaric process?
Delta T = 0
Q = 0
Delta V = 0
Delta P = 0
Two uncharged, conducting spheres are held at rest on insulating stands and are in contact. A positively charged rod is brought near one sphere. While the rod is in place, the two spheres are separated. How will the spheres be charged, if at all?
Yes, the sphere closest to the rod will have a net negative charge while the sphere farthest from the rod will have a net positive charge
No, they will not be charged
Yes, the sphere closest to the rod will have a net positive charge while the sphere farthest from the rod will have a net negative charge
A hot air balloon open at one end rises when the air inside is heated by a flame from underneath. The density of the air inside of the balloon compared to the density of the air outside of the balloon is
Higher
Lower
The same
For this configuration of charges of equal magnitude spaced an equal distance apart, what is the direction of the net force on the charge in the upper right hand corner due to the other three charges?
To the right
Up
Up and to the right
Down and to the left
Two positive point charges Q and 2Q are separated by a distance R. If the charge Q experiences a force of magnitude F when the separation is R, what is the magnitude of the force on the charge 2Q when the separation is 2R?
F
F/2
F/4
4F
2F
Point A is a distance d away from a point charge Q. Point B is a distance 4d away from the same Q. What is the ratio of the electric field at point B to the electric field at point A?
1/9
1/16
1/3
1/4
Which two thermodynamic processes occur during a Carnot cycle?
Isochoric and isobaric
Isothermal and isochoric
Isothermal and adiabatic
Isochoric and adiabatic
Suppose a gas expands to twice its original volume in two ways: (1) adiabatically and (2) isothermally. Which process would result in a greater change in entropy?
1
2
Both the same
Four different charge pair configurations are shown. Each charge is a multiple of the charge q and each separation distance is a multiple of the length L. Rank the configurations from smallest to greatest magnitude of the electrostatic force.
A, D, B, C
B, C, A, D
C, A, B, D
D, B, C, A
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