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Lorentz force acting on fast-moving charged particles in a bubble chamber.Positive and negative charge trajectories curve in opposite directions. In physics, specifically in electromagnetism, the Lorentz force law is the combination of electric and magnetic force on a point charge due to electromagnetic fields.
Slide shows had their beginnings in the 1600s, when hand-painted images on glass were first projected onto a wall with a "magic lantern".By the late 1700s, showmen were using magic lanterns to thrill audiences with seemingly supernatural apparitions in a popular form of entertainment called a phantasmagoria.