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In this lesson, you will learn what entropy is in physics. Entropy is the measure of disorder in a system, it measures how many states the system of particles can be in. We will also explore the concept of electric fields, magnetic fields, electromagnetic waves, and maxwell's equations. Maxwell's equations govern how electric and magnetic fields interact with each other, and they also predict that em waves will propagate at the speed of light. We also discuss how electric fields and magnetic fields exert forces on charged particles in different ways in nature.