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Chapter 18: Q6CQ (page 661)
Why does a car always attract dust right after it is polished? (Note that car wax and car tires are insulators.)
Static electricity is responsible for the attraction of dust particles toward the car.
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If qA=0 in Figure, under what conditions will there be no net Coulomb force on q?
Figure Four point chargesqa, qb,qc, and lie on the corners of a square andq is located at its center.
Bare free charges do not remain stationary when close together. To illustrate this, calculate the acceleration of two isolated protons separated by\({\bf{2}}.{\bf{00}}{\rm{ }}{\bf{nm}}\)(a typical distance between gas atoms). Explicitly show how you follow the steps in the Problem-Solving Strategy for electrostatics.
A test charge of \({\rm{ + 2 \mu C}}\) is placed halfway between a charge of \({\rm{ + 6 \mu C}}\) and another of \({\rm{ + 4 \mu C}}\) separated by \(10{\rm{ cm}}\). (a) What is the magnitude of the force on the test charge? (b) What is the direction of this force (away from or toward the \({\rm{ + 6 \mu C}}\)charge)?
In regions of low humidity, one develops a special 鈥済rip鈥� when opening car doors, or touching metal door knobs. This involves placing as much of the hand on the device as possible, not just the ends of one鈥檚 fingers. Discuss the induced charge and explain why this is done.
Compare and contrast the Coulomb force field and the electric field. To do this, make a list of five properties for the Coulomb force field analogous to the five properties listed for electric field lines. Compare each item in your list of Coulomb force field properties with those of the electric field鈥攁re they the same or different? (For example, electric field lines cannot cross. Is the same true for Coulomb field lines?)
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