Electric Force, Field, and Potential
What happens when a positively charged object is brought near another positively charged object?
Their charges cancel out
They attract each other
They combine to form a neutral object
They repel each other
How does inserting a dielectric material between two charged parallel plates affect their capacitance and stored energy assuming voltage remains constant?
Both capacitance and stored energy decrease.
Capacitance increases while stored energy remains constant.
Capacitance decreases while stored energy increases.
Both capacitance and stored energy increase.
What happens when two protons are brought close together?
Correct repulsive electrostatic forces push them apart
One attractive gravitational pull brings them closer
Two weak nuclear forces hold them together
Three strong nuclear forces cause fusion reactions
Which experiment demonstrates both particle and wave behaviors in electrons simultaneously?
Electrons create an interference pattern in a double-slit experiment while also causing localized impacts on detection screens.
Detecting beta radiation emissions illustrates purely particle characteristics due to their charge and mass alone.
Using X-ray crystallography shows orderly diffracted patterns but does not reveal dual behavior directly in electrons themselves.
Measuring the discrete energy levels absorbed or emitted by atoms using spectroscopy highlights electron orbitals’ sizes and energies only.
What unit denotes capacitance?
Weber
Farad
Lumen
Kelvin
When comparing different configurations involving three point charges forming triangles where each has identical magnitudes but alternating signs, which arrangement minimizes net electrical force experienced by any single charge?
An isosceles triangle with like charges at the base and opposite charge at the vertex minimizes force on the base charges.
Scalene triangle with uneven angle proportions that create balanced conditions thus reducing overall force levels resulting in zero net effects on any charge given point.
Equilateral triangle where every charge affects others equivalently leading to a homogeneous distribution but not necessarily minimized forces on each charge.
Right-triangle specifying a right angle with an opposite sign that provides stability and recognizable system pattern yet doesn't ensure minimized impacts across individual charges present within the geometrical structure set up.
Which law quantifies the electric force between two point charges?
Newton's Second Law
Faraday's Law of Electromagnetic Induction
Coulomb's Law
Ohm's Law

How are we doing?
Give us your feedback and let us know how we can improve
What experimental result supported the idea that electric charge is quantized?
Young's double-slit experiment
Thomson's cathode ray tube experiment
Rutherford's gold foil experiment
Millikan's oil drop experiment
What happens to the magnitude of the electric force if you double one of the charges in Coulomb’s Law?
It halves.
It quadruples.
It doubles.
No change occurs.
In what situation would convection be most likely responsible for transferring thermal energy?
Fluids being heated and rising due to decreased density causing circulation patterns.
Direct physical contact allowing kinetic energy exchange between particles at different temperatures.
Radiation from a hot surface directly heating another body across empty space.
External force performing work and converting kinetic into potential or thermal energy.