Science Test 3

If a newly discovered particle had the same mass as an electron but a positive charge, what would be the expected behavior in an electric field?

• It would follow magnetic lines instead of electric lines.

• It would move randomly in all directions.

• It would experience no force in a field.

• It would accelerate in the same direction as protons do in the field.

• Both B and C.

What distinguishes gravitational force from electric force at the atomic level?

• Electric force is always attractive.

• Gravitational force acts on electrons only.

• Electric force can attract or repel, while gravity only attracts.

• Gravitational force dominates in atomic systems.

• Electric force has no inverse square relationship.

If the mass of the electron were equal to that of the proton, how would this impact the structure of atoms and electric interactions?

• Atoms would collapse due to attraction

• Electrons would repel protons more effectively.

• The electric field would increase.

• Electric charge would be neutralized.

• Electrons would no longer orbit significantly; both charges would behave similarly.

A metal object is placed in a region with a uniform electric field. Which of the following BEST predicts how the charges within the object will behave?

• They will form a dipole at the center.

• Free electrons will redistribute to cancel the field inside the conductor.

• Positive charges will accumulate on both ends.

• Electrons will escape to the environment.

• The charges will oscillate.

Why is electric force more noticeable at the atomic level than gravitational force?

• Gravitational constants are larger.

• Electric charge is heavier.

• Electric force is many orders of magnitude stronger than gravity.

• Gravity pushes electrons outward.

• Electricity only acts on electrons.

If Coulomb’s constant (k) were one million times smaller, how would this change the behavior of charged particles in daily life?

• Electric interactions would become too weak to form stable atoms.

• Only electrons would be affected.

• Gravity would become repulsive.

• Electromagnetic radiation would increase.

• Electric force would act like magnetism.

Why would removing electrons from every atom in a conductor drastically affect its electrical properties?

• Charge mobility would be lost, making conduction impossible

• It would increase heat capacity

• It would make it magnetic

• Protons would begin to move

• The atomic number would increase

The significance of Benjamin Franklin’s kite experiment in the context of identifying natural electric phenomena was that it

• demonstrated gravity's dominance

• disproved Coulomb’s law

• invented the field concept

• measured electron mass

• provided evidence that lightning is an electrical phenomenon

Given that electric field lines never cross, what conclusion can you draw if two field lines seem to intersect in a diagram?

• The field is uniform.

• The diagram shows gravitational fields.

• The charges are neutral.

• One field is stronger

• The drawing is incorrect, as a field cannot point in two directions at once.

When comparing electric fields from a point charge and a charged plate, which of the following is TRUE?

• Both decrease with distance

• Both are constant.

• Point charge fields decrease with distance; plate fields are constant near the center.

• Plate fields are stronger at the edges.

• Point fields do not affect other charges