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Exam 10: Electricity

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Question 31

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Consider the following circuit: -Please find the effective resistance of the circuit.

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ANS: R^eff = 3...

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Question 32

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You have just built a house out in the country and it comes to your attention that you need to install a lightning rod. Being naturally curious you ask a hardware salesperson how lightning rods work and they correctly tell you that

A) they attract lightning.
B) they repel lightning.
C) they use corona discharge to bleed off local charge accumulations.
D) they use electrostatic precipitation to remove excess charge from the air.

E) A) and C)
F) None of the above

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Question 33

Multiple Choice

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The principal advantage of sending electric power across long distances using low current is that

A xerographic copier uses a special photoconductor surface that allows light from an original document to control the placement of black powder on white paper. The photoconductor only conducts electricity when it's exposed to light because, in the dark,

You decide to help your physics professor do an interactive classroom demonstration. You are standing on a plastic bench that insulates you from your surroundings. Both you and the helium balloon you are holding are electrically neutral. You now rub the balloon against your sweater, so that the balloon becomes negatively charged, and then let the balloon float away. You are left

Suppose you have a 12V battery supplying current to a 6Ω resistor. -If you trace electrons around the circuit, they actually go from high voltage to low voltage through the battery. Please explain why this takes energy from the battery.

Suppose you have a semiconductor with many electrons that have been able to jump the band gap. This object really is a (an)

Your cat has chewed the cord to your desk lamp and has created a short circuit-an electric connection from one wire to the other inside the cord. When you plug the lamp into the electric outlet,

In an insulator, the band gap between the valence band and the conduction band is

Who invented the xerographic copying process?

You are stranded on an Arctic wasteland with your physics class. Forget food and survival - you're playing with circuits to pass the long winter months. You have two batteries, some wire and two light bulbs. If you must use both batteries and both bulbs how would you hook them up so as to get -maximum brightness

You are an engineer and are building metal objects for a science lab that are supposed to hold charge for a long time. The object should not be

Suppose you have a 12V battery supplying current to a 6Ω resistor. -Calculate the current through the resistor.

A 60 watt, 120 volt light bulb is designed to operate at a 1/2 A current. If you screw this bulb into a fixture that is powered by very long thin wires it will glow more dimly than intended because the voltage drop across the bulb will be

A power line carries current 10 A and has resistance 2.0 $\Omega$ . What is the voltage drop across the line?

You and a friend are spending the weekend making up missed lab experiments. You are on to second - semester material and are studying the electrostatic interaction of two charges. You notice that two charges are exerting a certain force on one another. If the distance between two electric charges becomes 1/3 of what it originally was, then the force they exert on each other changes by how much?

You and a friend are walking together along a beautiful shoreline. You get bored and begin to make electrostatics measurements. It turns out that you have a charge of +4 Coulombs and your friend a charge of -1 Coulombs. What is the product of your two charges?

Suppose your instructor staggers into class the morning after an all-night 4x4 truck engine pulling party. She proceeds to do a demonstration in class where she measures a 100N force of attraction between two particles each carrying a positive charge of 1C and separated by 3m. Moreover she cuts the distance to ¼ of what it originally was and she claims the force then changes to a new value of 25N. Specific to the scientific content of her demonstration please give three reasons why you know that her claims are wrong; there's more than three, trust me. One of your three points must be quantitative - involving a force calculation of some sort.

Polarization

You notice that a light at home keeps going out but you are certain that the bulb is good. Such behavior could result from