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Chapter 18: Q30CQ (page 663)

Tollbooth stations on roadways and bridges usually have a piece of wire stuck in the pavement before them that will touch a car as it approaches. Why is this done?

Short Answer

Expert verified

The wire is attached to the pavement before tollbooth stations in roadways and bridges so that the accumulated charges on the car get discharged before causing harm to the people in the tollbooth.

Step by step solution

01

Static electricity

When two different materials are rubbed together, they produce static electrical charges on their surface and produce static electricity.

02

Attaching a small wired to the pavement

Due to friction between the car and the air molecules, static charges developed onto the car. Suppose the car moves with greater velocity, more static charges develop onto it.

When the car reaches the tollbooth, there is a chance that these collected charges discharge when coming close to the metal barricades in the booth and can cause harm to the people in the booth.

Hence, a small wire is placed attached to the pavement before tollbooth stations on roadways and bridges so that the accumulated charges on the car get discharged before causing harm to the people in the tollbooth.

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Most popular questions from this chapter

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The classic Millikan oil drop experiment was the first to obtain an accurate measurement of the charge on an electron. In it, oil drops were suspended against the gravitational force by a vertical electric field. (See Figure 18.58.) Given the oil drop to be\(1.00{\rm{ }}\mu {\rm{m}}\)in radius and have a density of\(920{\rm{ kg}}/{{\rm{m}}^3}\): (a) Find the weight of the drop. (b) If the drop has a single excess electron, find the electric field strength needed to balance its weight.

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