General Physics 2: Electromagnetism and Optics

Front

Who created the 'voltaic pile' (battery) and in what year?

Back

Alessandro Volta created the 'voltaic pile' in 1800.

Front

What does Oersted's Law state?

Back

Oersted's Law states that when a steady electric current passes through a wire, it creates a magnetic field around it.

Front

What is Ampere's Law?

Back

Ampere's Law states that the force between currents is inversely proportional to the distance between them and directly proportional to the intensity of the current.

Front

What was the first electromagnet created by William Sturgeon?

Back

The first electromagnet was a horseshoe-shaped piece of iron wrapped with a loosely wound coil.

Front

What significant improvement did Joseph Henry make to electromagnets?

Back

Joseph Henry was able to wrap a large number of turns of wire around the core, greatly increasing the power of the magnet.

Front

What is electromagnetic induction?

Back

Electromagnetic induction is the process of producing emf by changing the magnitude or direction of a magnetic field.

Front

What is Faraday's First Law?

Back

Faraday's First Law states that whenever a conductor is placed in a varying magnetic field, an emf is induced.

Front

What does Lenz's Law state?

Back

Lenz's Law states that an induced electric current flows in a direction that opposes the change that induced it.

Front

What are some applications of electromagnetism?

Back

Applications include electric motors, electromagnetic locks, MRI machines, electromagnetic cranes, and Maglev trains.

Front

What is the definition of electromotive force (EMF)?

Back

EMF is the electric potential produced by either an electrochemical cell or by changing the magnetic field.