A line of charge refers to a distribution of electric charge that is concentrated along an infinitely long, straight line.
Imagine a long, thin wire with evenly spaced beads threaded onto it. Each bead represents a small amount of charge. The line of charge is like the wire with the beads, where the charges are aligned in a linear fashion.
Sheet of Charge: A sheet of charge refers to a distribution of electric charge that is concentrated on an infinitely large, flat surface.
Linear charge density (ƛ): Linear charge density is a measure of how much electric charge exists per unit length along a line or wire.
Electric Field: Electric field refers to the region around an electrically charged object where another charged object experiences an electric force.
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