PHY 182 1st Edition Lecture 13Outline of Last Lecture I. What causes Charge?II. Electric FieldsOutline of Current Lecture I. Line of ChargeII. Rings and DisksIII. Infinite PlaneCurrent LectureLine of Charge- A line of charge, also known as a charged rod, is the first situation for which we will discuss how to calculate electric field.- An important value that is included in these calculations is the linear charge density, which is the charge divided by the length of the rod.- The simplest situation for a line of charge is when the rod is positioned so that half of its length is above the y-axis and half is below. This situation is the simplest because the electric field in the y-direction cancels as equals zero.- If the x (the distance from the rod) is much bigger than a (half the length of the rod), the line of charge can be modeled as a point charge.- If you are very close to a relatively large line of charge (distance is 1% or less of length), the line of charge can be modeled as an infinite line of charge.Rings and Disks- For rings and disks, you may need to involve the quantity of surface area density when calculating electric field strength. This varies from linear charge density in that surface area density is charge divided by surface area.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- A ring or disk of charge can be modeled as a point charge if x is much larger than a (the radius).Infinite Plane- For an infinite plane, the electric field does not depend on the distance from the charge (which is an important note to remember).- A parallel plate capacitor is formed when two infinite planes are near each other and oriented in the same direction. The electric field is zero at every place except between the two planes. Between the two plates, there is a uniform electric field that varies only by surface area
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