Electricity and Magnetism Review

Which rule is often used to determine the direction of magnetic fields in electromagnetism?

• Left Hand Rule

• Water Flow Rule

• Right Hand Rule

• Electron Flow Rule

Answer explanation

The right hand rule is commonly used to determine the direction of magnetic fields in electromagnetism.

What is one of the topics that might be covered when learning about the interactions between electricity and magnetism?

• How to Make Electromagnets

• How to Measure Electric Charge

• How to Create Electric Fields

• How to Use Electrons

Answer explanation

One of the topics covered when learning about the interactions between electricity and magnetism is how to make electromagnets. This involves understanding the relationship between electric currents and magnetic fields.

What is the charge of one electron?

• q = +1 or 1.602×10^-19 C

• q = -1 or -1.602×10^-19 C

• q = 0 or 0 C

• q = -1 or 1.602×10^19 C

Answer explanation

The charge of one electron is -1 or -1.602×10^-19 C. This is the correct choice.

What happens when the overall charge is not in balance?

• There is a net charge

• There is no net charge

• The electrons are destroyed

• The electrons multiply

Answer explanation

When the overall charge is not in balance, there is a net charge. This means that the total positive charge is not equal to the total negative charge.

What changes the net charge of a balloon when it is rubbed?

• Heating the balloon

• Freezing the balloon

• Rubbing the balloon

• Inflating the balloon

Answer explanation

Rubbing the balloon changes its net charge.

What is the principle that explains why water is attracted to a balloon and why balloons stick to cats?

• Like charges attract

• Oppositely charged objects attract, like charges repel

• Neutral charges attract

• Oppositely charged objects repel

Answer explanation

Oppositely charged objects attract, like charges repel. This principle explains why water is attracted to a balloon and why balloons stick to cats.

What does Coulomb's Law describe?

• The relationship between electric charges and electric fields.

• The equation for the magnitude of the force between electrically charged particles or objects.

• The calculation of gravitational forces between two masses.

• The process of charging by induction.

Answer explanation

Coulomb's Law describes the force between charged particles or objects.

What does "k" represent in the context of Coulomb's Law?

• The variable representing distance in meters

• The charge of an electron

• The Coulomb's constant, which depends on the medium between the charged particles/objects

• The symbol for kinetic energy

Answer explanation

The variable 'k' represents the Coulomb's constant, which depends on the medium between the charged particles/objects.

What is the approximate value of Coulomb's constant "k" in air?

• 9.0 x 10^9 N * m^2 / C^2

• 6.67 x 10^-11 N * m^2 / kg^2

• 3.0 x 10^8 m/s

• 1.6 x 10^-19 C

Answer explanation

Coulomb's constant 'k' in air is approximately 9.0 x 10^9 N * m^2 / C^2, which is the correct choice.

In Coulomb's Law, what do "q1" and "q2" represent?

• The masses of the two particles

• The electric charges of the two particles

• The distance between the two particles

• The potential energy between the two charges

Answer explanation

In Coulomb's Law, 'q1' and 'q2' represent the electric charges of the two particles.