genphys 2

electron

Which subatomic particle is the lightest (has the least mass)?

a

If you touch a metal doorknob after walking on a carpet and feel a shock, you have acted as a:

a. Conductor for static discharge

b. Battery

c. Generator

d. Insulator

c

Glass, porcelain, and ceramic are often used as:

a. Sources of voltage

b. Batteries

c. Insulators on high-voltage lines

d. Conductors on high-voltage lines

electrostatic attraction

The force that holds electrons in orbit around the nucleus is:

b

Which of the following is true about "Current Electricity"?

a. It is typically caused by friction

b. It requires a closed circuit to flow continuously

c. It cannot be controlled

d. It involves charges at rest

b

In an insulator, the electrons are:

a. Free to move anywhere 

b. Tightly bound to their atoms

c. Positively charged

d. Flowing in a current

copper

Which metal is the most commonly used conductor in household wiring due to its balance of cost and conductivity?

d

Silver is a better conductor than copper, but it isn't used for standard wiring because:

a. It is too brittle

b. It is magnetic

c. It overheats too easily

d. It is too expensive

electric field

The space around a charged object where an electric force is exerted is called the:

electrically neutral

An object that has equal numbers of protons and electrons is considered:

b

In a conductor, the electrons are:

a. Stuck in a rigid lattice |

b. Free to move randomly

c. Absent entirely

d. Tightly bound to the nucleus

d

Which of these is NOT a common method of creating static electricity?

a. Conduction (touching) 

b. Friction (rubbing)

c.  Induction (bringing charged object near) 

d. Sublimation (heating)

insulator

Pure water (distilled water) is actually a(n):

b

Why does tap water or saltwater conduct electricity while pure water does not?

a. It is colder

b. It has dissolved ions (minerals/salts)

c. It has more oxygen

d. It is less dense

a

The electricity supplied to outlets in most homes is:

a. Alternating Current (AC)

b. Static Electricity

c. Direct Current (DC)

d. Chemical Electricity

d

Which of the following materials is a semiconductor (somewhere between a conductor and insulator)?

a. Iron

b. Gold

c. Rubber

d. Silicon

d

If you bring a positively charged rod near a negatively charged sphere, they will:

a. Spin in circles 

b. Have no effect on each other

c. Repel each other 

d. Attract each other

electrons

In an uncharged (neutral) atom, the number of protons is equal to the number of: 

b

What happens to the electrical force between two charged objects if you move them closer together?

a. The force disappears 

b. The force increases 

c. The force decreases

d. The force stays the same

d

Which term describes the flow of electric charge in only one direction (like from a battery)?

a. Variable Current 

b. Static Current 

c. Alternating Current (AC)

d. Direct Current (DC)

b

Which of the following is the best example of an electrical insulator?

a. Saltwater 

b. Plastic 

c. Silver

d. Aluminum 

c

Why are electrical wires usually covered in rubber or plastic?

a. To make the electricity move faster

b. To add resistance to the circuit

c. To insulate the wire and prevent shock

d. To keep the wires warm 

static electricity

When you rub a balloon on your hair and it sticks to the wall, this is caused by:

conductor

A material that allows electricity to flow through it easily is called a(n):

insulator

A material that does NOT allow electricity to flow through it easily is called a(n):

c

Which of the following is the best example of a good electrical conductor?

a. Dry Wood 

b. Rubber

c. Copper

d. Glass

current electricity

Which type of electricity is the continuous flow of electrons through a material?

static discharge

Lightning is a spectacular natural example of:

valence electrons

Which electrons are most important for electrical conductivity because they are loosely held by the nucleus?

positive

If an atom loses electrons, what is its net charge?

d

Electricity is best defined as:

a. The vibration of molecules in a solid

b. The movement of sound waves through a vacuum

c. The gravitational pull between two masses

d. The flow of electrical power or charge

static electricity

Which type of electricity refers to an imbalance of electric charges within or on the surface of a material?

neutron

Which particle has no electrical charge (neutral)?

a

The "Law of Electric Charges" states that:

a. Like charges repel; opposite charges attract

b. All charges attract each other

c. All charges repel each other

d. Like charges attract; opposite charges repel

negative

If an atom gains extra electrons, what is its net charge?

nucleus

Which part of an atom is located in the center and contains most of its mass?

positive

What is the electrical charge of a proton?

negative

What is the electrical charge of an electron?

electrons

What is the fundamental particle responsible for the flow of electricity in solid conductors?

nucleus

Which part of an atom is located in the center and contains most of its mass?

ion

An atom or molecule that carries a net charge due to the loss or gain of one or more electrons

Charles Augustin de Coulomb

In a later memoir he showed that the force is also proportional to the product of the charges -a relationship now called “Coulomb’s Law

electrostatic force

The attraction or repulson between electric charges (F)

electric charge

determines the electric interaction and magnetic interaction between subatomic particles (q)

coulomb’s law

it quantifies the electrostatic force between two charges

ke

electrostatic constant

r

seperation distance of charges

coulomb’s law

is directly proportional to the product of the charges and indirectly proportional to the square of the distance the two charges