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Chapter 23: Q. 8 (page 652)
A circular disk has a surface charge density . What will the surface charge density be if the radius of the disk is doubled?
The surface charge density if the radius of the disk is doubled from .
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What are the strength and direction of the electric field at the position indicated by the dot in FIGURE P? Give your answer (a) in component form and (b) as a magnitude and angle measured cw or ccw (specify which) from the positive -axis.
A positron is an elementary particle identical to an electron except that its charge is . An electron and a positron can rotate about their center of mass as if they were a dumbbell connected by a massless rod. What is the orbital frequency for an electron and a positron apart?
The ozone molecule has a permanent dipole moment of 1. Although the molecule is very slightly bent— which is why it has a dipole moment—it can be modeled as a uniform rod of length with the dipole moment perpendicular to the axis of the rod. Suppose an ozone molecule is in a uniform electric field. In equilibrium, the dipole moment is aligned with the electric field. But if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion. What is the frequency of oscillation?
A -diameter glass sphere has a charge of . What speed does an electron need to orbit the sphere above the surface?
Your physics assignment is to figure out a way to use electricity to launch a small -long plastic drink stirrer. You decide that you’ll charge the little plastic rod by rubbing it with fur, then hold it near a long, charged wire, as shown in FIGURE P23.56. When you let go, the electric force of the wire on the plastic rod will shoot it away. Suppose you can uniformly charge the plastic stirrer to and that the linear charge density of the long wire is . What is the net electric force on the plastic stirrer if the end closest to the wire is away?
Hint: The stirrer cannot be modeled as a point charge; an integration is required.
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