DSM 23 Electric Potential Energy and Electric Potential

Which of these is a good description of the difference between electric potential energy and electric potential? A. Electric potential energy is a property of a system of multiple charges while electric potential is a property of a location in space near a charge distribution. B. Electric potential and electric potential energy are just two names for the same thing. There is no difference. C. Electric potential is the same as electric potential energy, but extends the concept so that it is applicable when only one charge is present. D. Electric potential energy is a property of a single location while electric potential describes the difference between two different locations.

A. Electric potential energy is a property of a system of multiple charges while electric potential is a property of a location in space near a charge distribution.

If an object with charge +2 nC moves from a location that has a potential of 20 V to a location with a potential of -10 V, what has happened to the potential energy of the system? A. The potential energy of the system has decreased by delta U is equal to negative 30 V times 2 times n times C. B. The potential energy of the system has increased by delta U is equal to positive 30 V times 2 times n times C. C. The potential energy of the system has increased by delta U is equal to positive 10 V times 2 times n times C. D. The potential energy of the system has decreased by delta U is equal to negative 10 V times 2 times n times C.

A. The potential energy of the system has decreased by delta U is equal to negative 30 V times 2 times n times C.

A cube of copper and a sphere of aluminum are both positively charged and connected by a wire. What do the two conductors have in common? A. They both have the same electric potential. B. They both have the same net charge. C. They both create the same electric field measured 1 meter from their surfaces. D. They both have the same electric field at their surfaces.

A. They both have the same electric potential.

As we consider various points that are all on the same equipotential surface near some distribution of charge, ______. A. the electric potential is the same at every point B. the electric potential is zero everywhere on the surface C. the electric potential changes by the same amount when you move equal distances D. the electric potential energy is the same at every point

A. the electric potential is the same at every point

As we consider various points that are all on the same equipotential surface near some distribution of charge, ______. A. the electric potential is the same at every point, but the electric potential energy is different at every point B. the electric potential is different at each point and the electric potential energy is different at every point C. the electric potential is different at each point but the electric potential energy is the same at every point D. the electric potential is the same at every point and the electric potential energy is the same at every point

A. the electric potential is the same at every point, but the electric potential energy is different at every point

How are electric field lines related to equipotential surfaces? A. Electric field lines are always parallel to equipotential surfaces and point toward locations of lower potential. B. Electric field lines are always perpendicular to equipotential surfaces and point toward locations of lower potential. C. Electric field lines are always parallel to equipotential surfaces and point toward locations of higher potential. D. Electric field lines are always perpendicular to equipotential surfaces and point toward locations of higher potential.

B. Electric field lines are always perpendicular to equipotential surfaces and point toward locations of lower potential.

Which of the following is a good description of the electric force between stationary charged objects? A. The electric force between stationary charged objects is a non-conservative force for which there is a corresponding potential energy. B. The electric force between stationary charged objects is a conservative force for which there is a corresponding potential energy. C. The electric force between stationary charged objects is a conservative force for which there is not a corresponding potential energy. D. The electric force between stationary charged objects is a non-conservative force for which there is not a corresponding potential energy.

B. The electric force between stationary charged objects is a conservative force for which there is a corresponding potential energy.

If an electron is moved a certain distance directly opposite an external electric field, what can we say about the change in the electric potential it experiences? A. The electric potential it experiences will stay the same. B. The electric potential it experiences will increase. C. The electric potential it experiences will decrease. D. We cannot predict how the electric potential it experiences will change.

B. The electric potential it experiences will increase.

If an object with charge -3 nC moves from a location that has a potential of -20 V to a location with a potential of -10 V, what has happened to the potential energy of the system? A. The potential energy of the system has decreased by delta U is equal to positive 30 V times 3 times n times C. B. The potential energy of the system has decreased by delta U is equal to negative 10 V times 3 times n times C. C. The potential energy of the system has increased by delta U is equal to negative 30 V times 3 times n times C. D. The potential energy of the system has increased by delta U is equal to positive 10 V times 3 times n times C.

B. The potential energy of the system has decreased by delta U is equal to negative 10 V times 3 times n times C.

Consider a point 1 cm away from an electron with nothing else nearby. What expression could represent the electric potential at that location? A. V is equal to negative start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e over 0.01 m squared end fraction B. V is equal to negative start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e over 0.01 m end fraction C. V is equal to negative start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e squared over 0.01 m end fraction D. V is equal to positive start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e over 0.01 m end fraction

B. V is equal to negative start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e over 0.01 m end fraction V=-1/4piEtheta |qe|/(0.01m)

Consider two point charges, A and B, separated by a distance, d. How would we find the total electric potential energy of this arrangement? A. Calculate the energy applied to each charge by the other and add them up. B. Calculate the electric potential energy that each charge has on its own and add them up. C. Calculate one electric potential energy for the pair. D. Calculate the electric potential energy that each charge has on its own and subtract one from the other.

C. Calculate one electric potential energy for the pair.

If there is a system with a proton and an electron, can the electric potential energy of the system be exactly zero? A. Yes, if they are less than 1 nanometer apart. B. Yes, as long as their electric fields are equal but opposite. C. No, it will be negative no matter how they are arranged. D. No, it will be positive no matter how they are arranged.

C. No, it will be negative no matter how they are arranged.

An arbitrarily shaped piece of conductor is given a net positive charge and is alone in space. What can we say about the electric potential within the conductor? Assume that the electric potential is zero at points that are very far away from the conductor. A. The electric potential in the conductor will be negative and constant throughout the conductor. B. The electric potential in the conductor will be positive and will vary by location. C. The electric potential in the conductor will be positive and constant throughout the conductor. D. The electric potential in the conductor will be negative and will vary by location.

C. The electric potential in the conductor will be positive and constant throughout the conductor.

When two electrons are 1 cm apart, what expression could represent their electric potential energy? A. U is equal to negative start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e squared over 0.01 m end fraction B. U is equal to start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e squared over 0.01 m squared end fraction C. U is equal to start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e squared over 0.01 m end fraction D. U is equal to start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e over 0.01 m end fraction

C. U is equal to start fraction 1 over 4 times pi times epsilon naught end fraction times start fraction the absolute value of q sub e squared over 0.01 m end fraction

If an electron is moved in a direction perpendicular to an equipotential surface, ______. A. it will be moving in exactly the opposite direction as the electric field at that location B. it will be moving in the same direction as the electric field at that location C. it will be moving either in the same or exactly opposite direction as the electric field at that location D. it cannot be moving in the same direction as the electric field at that location

C. it will be moving either in the same or exactly opposite direction as the electric field at that location

When an electron approaches a positively charged nucleus, ______. A. the electric potential energy of the system decreases while the potential at the electron's location decreases B. the electric potential energy of the system increases while the potential at the electron's location decreases C. the electric potential energy of the system decreases while the potential at the electron's location increases D. the electric potential energy of the system increases while the potential at the electron's location increases

C. the electric potential energy of the system decreases while the potential at the electronâs location increases

If an electron moves in a direction perpendicular to an equipotential surface, ______. A. the electric field it experiences must change B. the electric field it experiences must increase C. the potential it experiences must increase D. the potential it experiences must change

C. the potential it experiences must change

Consider three point charges, A, B, and C, arranged in an equilateral triangle, with distance d on each side. How would we find the total electric potential energy of this arrangement? A. Find the two electric potential energies (one for A and B, and one for B and C) and add them up. B. Find the three forces (one for each pair), add them up, and multiply by the distance, d. C. Calculate the energy applied to each charge by the others and then add up all of these contributions. D. Find the three electric potential energies (one for each pair) and add them up

D. Find the three electric potential energies (one for each pair) and add them up.

If there is a system with two electrons, can the electric potential energy of the system be exactly zero? A. Yes, as long as their electric fields are equal but opposite. B. No, it will be negative no matter how they are arranged. C. Yes, if they are more than 1 meter apart. D. No, it will be positive no matter how they are arranged.

D. No, it will be positive no matter how they are arranged.

If an electron is moved a certain distance directly opposite an external electric field, what can we say about the change in the electric potential energy of the system? A. The electric potential energy of the system will decrease. B. The electric potential energy of the system will stay the same. C. The electric potential energy of the system will increase. D. We cannot predict how the electric potential energy of the system will change.

The electric potential energy of the system will decrease.

If a proton is moved a certain distance directly opposite an external electric field, what can we say about the change in the electric potential energy of the system? A. The electric potential energy of the system will decrease. B. We cannot predict how the electric potential energy of the system will change. C. The electric potential energy of the system will increase. D. The electric potential energy of the system will stay the same.

The electric potential energy of the system will increase.

An arbitrarily shaped piece of conductor is given a net negative charge and is alone in space. What can we say about the electric potential within the conductor? Assume that the electric potential is zero at points that are very far away from the conductor. A. The electric potential in the conductor will be negative and will vary by location. B. The electric potential in the conductor will be positive and will vary by location. C. The electric potential in the conductor will be negative and constant throughout the conductor. D. The electric potential in the conductor will be positive and constant throughout the conductor.

The electric potential in the conductor will be negative and constant throughout the conductor.

If a proton is moved a certain distance directly opposite an external electric field, what can we say about the change in the electric potential it experiences? A. The electric potential it experiences will stay the same. B. We cannot predict how the electric potential it experiences will change. C. The electric potential it experiences will decrease. D. The electric potential it experiences will increase.

The electric potential it experiences will increase.

If there is a system with two electrons and a proton, can the electric potential energy of the system be exactly zero? A. Yes, as long as their electric fields are equal but opposite. B. No, it will be negative no matter how they are arranged. C. No, it will be positive no matter how they are arranged. D. Yes, it could be zero if they were arranged properly.

Yes, it could be zero if they were arranged properly

Every point on an equipotential surface ______. A. has both the same electric potential and the same electric field B. has the same electric field C. has neither the same electric potential nor the same electric field D. has the same electric potential

has the same electric potential