Electricity and Magnetism EOG Review

Front

What is an electric current?

Back

An electric current is the flow of electric charge, typically measured in amperes (A). It occurs when electrons move through a conductor, such as a wire.

Front

What is a magnetic field?

Back

A magnetic field is a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

Front

How can you demonstrate that an electric current produces a magnetic field?

Back

By using a battery, a coil of wire, and a compass, you can show that when current flows through the wire, the compass needle will deflect, indicating the presence of a magnetic field.

Front

What happens to the strength of a permanent magnet when heated?

Back

The strength of a permanent magnet decreases when heated because the heat causes the atoms in the magnet to move out of alignment.

Front

What is the relationship between distance and electrical force?

Back

The electrical force between two charged objects decreases as the distance between them increases, following Coulomb's law.

Front

What is electromagnetic strength?

Back

Electromagnetic strength refers to the ability of an electromagnet to exert a force on magnetic materials, which can be increased by increasing the number of turns of wire or the voltage.

Front

What is conduction in the context of electric charge?

Back

Conduction is the process by which electrons move from one object to another through direct contact, allowing charged objects to affect neutral objects.

Front

What is induction in the context of electric charge?

Back

Induction is the process by which a charged object can induce a charge in a neutral object without direct contact, often causing electrons to move within the neutral object.

Front

What is the effect of increasing voltage on an electromagnet?

Back

Increasing the voltage applied to an electromagnet increases its electromagnetic strength, allowing it to lift heavier objects.

Front

What is the difference between conductors and insulators?

Back

Conductors are materials that allow electric charge to flow easily (e.g., metals), while insulators are materials that resist the flow of electric charge (e.g., rubber, glass).