Science Test 2

Why do electrons, rather than protons, typically move during electric interactions?

• Protons are positively charged.

• Electrons are heavier.

• Protons are neutral.

• Electrons have more charge.

• Electrons are much less massive and can move more easily.

What determines the overall electric neutrality of an atom?

• the balance of neutrons and protons

• the number of orbital shells

• the atomic weight

• the total number of quarks

• the equality of protons and electrons

What is the relationship between force and distance in Coulomb’s law?

• Doubling distance halves the force.

• Tripling distance doubles the force

• Doubling distance reduces the force by a factor of four

• Force stays constant

• There is no relationship.

Which of the following materials is usually used for electric wires because it is an excellent conductor?

• Plastic

• Rubber

• Wood

• Glass

• Copper

Compared to Earth, which is closer to the Sun, how bright does Jupiter appear due to its distance?

• just as bright as Earth

• five times brighter than Earth

• five times dimmer than Earth

• twenty-five times dimmer than Earth

• ten times brighter than Earth

What is the main reason that charged conductors have zero electric field inside?

• The conductor reflects fields.

• Electrons are stationary inside.

• Excess charge moves to the surface and distributes symmetrically.

• Field lines are repelled from the center.

• The nucleus absorbs the electric field.

How does polarization allow a balloon to stick to a neutral wall?

• Protons in wall atoms are pulled closer to the balloon, while electrons are repelled.

• Electrons jump from balloon to wall.

• The balloon ionizes the wall.

• Protons are repelled into the air.

• Electric fields in the wall are canceled.

What happens to the kinetic energy of a ball when it stops moving after hitting the ground?

• It disappears completely

• It is converted into heat and sound

• It transforms into nuclear energy

• It becomes electric potential

• It turns back into light

How are the electric field lines around a proton different from those around an electron?

• Proton field lines point outward; electron field lines point inward.

• Electron fields are stronger.

• Proton fields curve; electron fields are straight.

• Electrons repel field lines.

• Protons absorb field vectors.

What happens at a point exactly halfway between two identical positive charges?

• The electric field is zero due to cancellation

• The field is at maximum strength

• The direction is uncertain

• There is magnetic interference

• Electrons gather there