Unit 4 Section 1: Electrostatics Practice Scrimmage

Which subatomic particle is responsible for carrying a negative electric charge?

• Proton

• Neutron

• Electron

• Positron

Answer explanation

The electron is the subatomic particle that carries a negative electric charge, while protons carry a positive charge and neutrons are neutral. Positrons are the antimatter counterparts of electrons, also carrying a positive charge.

Tags

NGSS.MS-PS2-3

What is the SI unit of electric charge?

• Volt

• Ampere

• Coulomb

• Ohm

Answer explanation

The SI unit of electric charge is the Coulomb. It quantifies the amount of electric charge, while Volt measures electric potential, Ampere measures current, and Ohm measures resistance.

Which law states that the total electric charge in an isolated system remains constant?

• Ohm’s Law

• Law of Conservation of Charge

• Newton’s First Law

• Faraday’s Law

Answer explanation

The Law of Conservation of Charge states that the total electric charge in an isolated system remains constant, meaning charge cannot be created or destroyed, only transferred. This distinguishes it from the other laws listed.

What is the process called when a neutral object becomes charged by being near a charged object, without direct contact?

• Charging by friction

• Charging by conduction

• Charging by induction

• Charging by radiation

Answer explanation

The process where a neutral object becomes charged by being near a charged object, without direct contact, is called charging by induction. This occurs due to the influence of the electric field of the charged object.

Tags

NGSS.HS-PS2-4

Which of the following materials is a good conductor of electricity?

• Rubber

• Glass

• Copper

• Wood

Answer explanation

Copper is a metal known for its excellent electrical conductivity, making it a good conductor of electricity. In contrast, rubber, glass, and wood are insulators and do not conduct electricity well.

Tags

NGSS.HS-PS2-5

What is the name of the effect where certain materials become electrically charged after they come into frictional contact with a different material?

• Photoelectric effect

• Triboelectric effect

• Magnetic effect

• Thermoelectric effect

Answer explanation

The effect where materials become electrically charged after frictional contact is called the Triboelectric effect. This phenomenon occurs when electrons are transferred between different materials, leading to static electricity.

Which of the following is an insulator?

• Silver

• Aluminum

• Plastic

• Iron

Answer explanation

Plastic is an insulator, meaning it does not conduct electricity well. In contrast, silver, aluminum, and iron are all good conductors of electricity.

What is the formula for Coulomb’s Law for the force between two point charges?

Answer explanation

Coulomb's Law describes the force between two point charges. The correct formula is F = k (q1 * q2) / r^2, where k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them.

Tags

NGSS.HS-PS2-4

What is the direction of the electric field produced by a positive point charge?

• Toward the charge

• Away from the charge

• Circular around the charge

• No direction

Answer explanation

The electric field produced by a positive point charge points away from the charge. This is because positive charges repel other positive charges, creating a field that radiates outward.

Which quantity is defined as the work done per unit charge to move a charge between two points in an electric field?

• Electric current

• Electric field

• Electric potential (Voltage)

• Resistance

Answer explanation

Electric potential, or voltage, is defined as the work done per unit charge to move a charge between two points in an electric field. It quantifies the energy needed to move charges, distinguishing it from current and resistance.