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Chapter 18: Q17CQ (page 662)
Is the object in Figure a conductor or an insulator? Justify your answer.
The object in the figure is an insulator.
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Figure 18.43 shows the charge distribution in a water molecule, which is called a polar molecule because it has an inherent separation of charge. Given water鈥檚 polar character, explain what effect humidity has on removing excess charge from objects.
Figure 18.43 Schematic representation of the outer electron cloud of a neutral water molecule. The electrons spend more time near the oxygen than the hydrogens, giving a permanent charge separation as shown. Water is thus a polar molecule. It is more easily affected by electrostatic forces than molecules with uniform charge distributions.
What is grounding? What effect does it have on a charged conductor? On a charged insulator?
A\(5.00{\rm{ g}}\)charged insulating ball hangs on a\(30.0{\rm{ cm}}\)long string in a uniform horizontal electric field as shown in Figure 18.56. Given the charge on the ball is\(1.00{\rm{ }}\mu {\rm{C}}\), find the strength of the field.
Figure 18.56 A horizontal electric field causes the charged ball to hang at an angle of\(8.00^\circ \).
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.
Why is a golfer with a metal club over her shoulder vulnerable to lightning in an open fairway? Would she be any safer under a tree?
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