Chapter 23: Q. 72 (page 657)
A proton orbits a long charged wire, making revolutions per second. The radius of the orbit is . What is the wire’s linear charge density?
Short Answer
The wire’s linear charge density is
Chapter 23: Q. 72 (page 657)
A proton orbits a long charged wire, making revolutions per second. The radius of the orbit is . What is the wire’s linear charge density?
The wire’s linear charge density is
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Get started for freeA problem of practical interest is to make a beam of electrons turn a corner. This can be done with the parallel-plate capacitor shown in FIGURE. An electron with kinetic energy enters through a small hole in the bottom plate of the capacitor.
a. Should the bottom plate be charged positive or negative relative to the top plate if you want the electron to turn to the right? Explain.
b. What strength electric field is needed if the electron is to emerge from an exit hole away from the entrance hole, traveling at right angles to its original direction?
Hint: The difficulty of this problem depends on how you choose your coordinate system.
c. What minimum separation must the capacitor plates have?
shows three charges at the corners of a square. Write the electric field at point in component form.
FIGURE is a cross section of two infinite lines of charge that extend out of the page. The linear charge densities are . Find an expression for the electric field strength at height above the midpoint between the lines.
A parallel-plate capacitor is formed from two --diameter electrodes spaced apart. The electric field strength inside the capacitor is . What is the charge (in ) on each electrode?
You’ve been assigned the task of determining the magnitude and direction of the electric field at a point in space. Give a step-by-step procedure of how you will do so. List any objects you will use, any measurements you will make, and any calculations you will need to perform. Make sure that your measurements do not disturb the charges that are creating the field.
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