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21 Cards in this Set

  • Front
  • Back

Conductors and insulators are two broad categories of what?

Electricity

What is a good conductor of heat and electricity?

Metal

What conducts neither heat nor electricity?

Insulators

What is the difference in how electrons behave when it comes to conductors and insulators.

Conductors have a lot of free electrons to move, insulators have very little.

Are atoms electrically positive, negative, or neutral?

They are neutral. They have the same number of protons and electrons.

What happens to electrons that move away from the nuclues?

They are less attracted to it.

What happens when an atom loses electrons?

It becomes positively charged

What happened when an atom gains electrons?

It becomes negatively charged

Why do we experience static in the winter?

Because it's is so dry the electrons are less tightly bonded.

What happens to positive and negative charges when close to one another?

They are attracted.

What happens when two positive or two negative charges are near each other?

They are repelled.

Positives and negatives are two types of what?

They are to types of charges

Which law states that the electrical force between two charges is given by F = K(q1q2/r²) where q1 is charge one, q2 it's charge two, and r is the distance between the charges?

Coulomb's Law

What does K equal in Coulomb's law?

K = 9.0 * 10^9 * Nm²/c²

What is the unit of charge? What is its symbol?

The unit is one Coulomb (C). The symbol is Q or q.

What's is one microcoulumb?

μC or x * 10^-6C

What is the best way to calculate electric force?

Isolate the exponents and multiply by the remaining ones:



9*10^9 * 2*10^-6 * 7*10^-6/(.2²) =


(9*2*7/(.2²)*10^9-6-6 = 3150 * 10^-3 = 3.15N.

What law is F = α * 1/distance²

The inverse square law.

What does the inverse square law do?

It means that force is inversely related to distance.

Using the inverse square law, originally F = 10N between two charges, if you increase the distance to twice its original value?

F = 1/2² = (1/4)N

Is force a vector or scalar quantity?

It is a vector quantity, meaning that you need to figure out the direction of each force.