Problem 1RCQ: Which part of an atom is positively charged, anti which part is negatively charged? Problem 2RCQ: How does the charge of one electron compare with that of another electron? Problem 3RCQ: How do the masses of electrons compare with the masses of protons? Problem 4RCQ Problem 5RCQ: What kind of charge does an object acquire when electrons are stripped from it? Problem 6RCQ: What is meant by saying that charge is conserved? Problem 7RCQ: How is Coulomb's law similar to Newton's law of gravitation? How is it different? Problem 8RCQ: How does a coulomb of charge compare with the charge of a single electron? Problem 9RCQ: How does the magnitude of electrical force between a pair of charged particles change when the... Problem 10RCQ: How does an electrically polarized object differ from an electrically charged object? Problem 11RCQ: Give two examples of common force fields. Problem 12RCQ: How is the direction of an electric field defined? Problem 13RCQ: In terms of the units that measure them, distinguish between electric potential energy and electric... Problem 14RCQ: A balloon may easily be charged to several thousand volts. Does that mean it has several thousand... Problem 15RCQ: What condition is necessary for a sustained flow of electric charge through a conducting medium? Problem 16RCQ: How much energy is given to each coulomb of charge passing through a 6-V battery? Problem 17RCQ: Does electric charge flow across a circuit or through a circuit? Does voltage flow across a circuit... Problem 18RCQ: Distinguish between dc and ac. Problem 19RCQ: Does a battery produce dc or ac? Does the generator at a power station produce dc or ac? Problem 20RCQ: Which has the greater resistance, a thick wire or a thin wire of the same length? Problem 21RCQ: What is the unit of electrical resistance? Problem 22RCQ: What is the effect on current through a circuit of steady resistance when the voltage is doubled?... Problem 23RCQ: Which has the greater electrical resistance, wet skin or dry skin? Problem 24RCQ: What is the function of the third prong on the plug of an electric appliance? Problem 25RCQ: What is the source of electrons that produces a shock when you touch a charged conductor? Problem 26RCQ: In a circuit consisting of two lamps connected in series, if the current in one lamp is 1 A, what is... Problem 27RCQ: If 6 V were impressed across the circuit in question 26, and the voltage across the first lamp were... Problem 28RCQ: How does the total current through the branches of a parallel circuit compare with the current... Problem 29RCQ: As more lanes are opened at a fast-food restaurant, the resistance to the motion of people and cars... Problem 30RCQ: What is the relationship among electric power, current, and voltage? Problem 35PAC: Coulombs Law: F=kq1q2d2 35. Two point charges, each with 0.1 C of charge, are 0.1 m apart. Knowing... Problem 36PAC: A toaster has a heating element of 15 and is connected to a 120-V outlet. Show that the current... Problem 37PAC: Show that when you touch your wet fingers (resistance 1000 ) to the terminals of a 6-V battery, the... Problem 38PAC: Calculate the current in the 240- filament of a bulb connected to a 120-V line. Problem 39PAC: An electric toy draw 0.5 A from a 120-V outlet. Show that the toy consumes 60 W of power. Problem 40PAC: Calculate the power of a hair dryer that operates on 120 V and draws a current of 10 A. Problem 41TAS: Two pellets, each with a charge of 1 microcoulomb (10-6 C), are located 3 cm (0.03 m) apart. Show... Problem 42TAS: Two point changes are separated by 4 cm. The attractive force between them is 20 N. Show that when... Problem 43TAS: Show that if the charges attracting each other in the preceding problem have equal magnitudes, each... Problem 44TAS: A droplet of ink in an industrial ink-jet printer carries a charge of 1.6 10-10 C and is deflected... Problem 45TAS: A 12-V battery moves 4 C of charge from one terminal to the other. Show that the battery does 48 J... Problem 46TAS: Suppose you could expend 10 joules of work to push a l-coulomb charged particle against an electric... Problem 47TAS: The potential difference between a storm cloud and the ground is 100 million volts. If a charge of 2... Problem 50TAS: The power in watts marked on a light bulb is not an inherent property of the bulb; rather, it... Problem 51TAS: Rearrange the formula Current = voltage/resistance (I=VR) to express resistance in terms of current... Problem 53TAS: Using the formula Power = current voltage, show that the current drawn by a 1200-W hair dryer... Problem 55TAS: A dehumidifier with a resistance of 20 draws 6.0 A when connected to an electrical outlet. Show... Problem 56TAS: An electric space heater dissipates 1320 W of power via electromagnetic radiation and convection... Problem 57TAS: The total charge that an automobile battery can supply without being recharged is given in terms of... Problem 58TAS: Show that it costs 7 cents to operate a 25-W porch light for 24 h if electric energy costs 12c per... Problem 59TAS: Suppose you operate a 100-W lamp continuously for 1 week when the power utility rate is 12c/kWh.... Problem 60TAS: An electric dryer connected to a 120-V source draws 8.4 A of current. Show that the amount of heat... Problem 61TAS: For the electric dryer of the previous problem, show that the number of coulombs that flow through... Problem 62TAS: An incandescent light bulb with an operating resistance of 95 is labeled "150 W." Is this bulb... Problem 63TAS: In periods of peak demand, power companies lower their voltage in order to save power (and save you... Problem 64TAR: The three pairs of same-size metal spheres have different charges on their surfaces, as indicated.... Problem 65TAR: Rank, from brightest to dimmest, the identical bulbs in the following circuits. Problem 66TAR: The bulbs are identical. Ammeters are placed in different location, as shown. Rank, from greatest to... Problem 67TAR: All bulbs, are identical in the circuits. An ammeter is connected next to each battery, as shown.... Problem 68TAR: All bulbs are identical in the circuits. A voltmeter is connected across a single bulb in each... Problem 69TAR: Consider the three parts of the circuit. First rank, from greatest to least, the current through... Problem 70E: At the atomic level, what is meant by saying something is electrically charged? Problem 71E: Why is charge usually transferred by electrons rather than by protons? Problem 72E: Why are objects with vast numbers of electrons normally not electrically charged? Problem 73E: If you scuff electrons from your shoes while walking across a silk rug, are you negatively or... Problem 74E: Why do clothes often cling together after tumbling in a clothes dryer? Problem 75E: An electroscope is a simple device consisting of a metal ball that is attached by a conductor to two... Problem 76E: The leaves of a changed electroscope collapse in time. At higher altitudes, they collapse more... Problem 77E: If electrons were positive and protons were negative, would Coulomb's law he written the same or... Problem 78E: When you double the distance between a pair of charged particle, what happens to the force between... Problem 79E: When you double the charge on only one of a pair of particles, what effect does this have on the... Problem 80E: When you double the charge on both particles in a pair, what effect does this have on the force... Problem 81E: If you rub an inflated balloon against your hair and place it against a metal door, by what... Problem 82E: If you rub an inflated balloon against your hair and place it against a wooden door, by what... Problem 83E: When a car is moved into a painting chamber, a mist of paint is sprayed around its body. When the... Problem 84E: By what specific means do the bits of fine threads align in the electric fields in Figure 8.11?... Problem 85E: Suppose that the strength of the electric field about an isolated point charge has a certain value... Problem 86E: Suppose an investigator places first a free electron and then a free proton into an electric field... Problem 87E: Why is voltage often referred to as an electric pressure, especially when electric circuits and... Problem 88E: Why might the wingspans of birds be a consideration in determining the spacing between parallel... Problem 89E: One example of a water system is a garden hose that waters a garden. Another is the cooling system... Problem 90E: How is a hydraulic pump that produces sustained water flow analogous to a battery or generator? Problem 91E: What is the difference between electric potential difference and voltage. Problem 92E: Why is a good conductor of electricity also a good conductor of heat? Problem 93E: Which travels at nearly the speed of light in an electric circuit: electrons, electric field, or... Problem 94E: Which flows through an electric circuit: voltage, electric charge, resistance, or all three? Problem 95E: Would you expect to find dc or ac in the filament of a light bulb in your home? In the headlight of... Problem 96E: Comment on the warning sign in the sketch. Problem 97E: Which has the higher resistance: a lamp filament with no current or one carrying current? Or do both... Problem 98E: Only a small percentage of the electric energy supplied to a common light bulb is transformed into... Problem 99E: What is the effect on the current in a wire if both the voltage across it and its resistance are... Problem 100E: Why is a bird perched on a high-voltage wire safe, even though the wires are not insulated? Problem 101E: Say the bird perched on a high-voltage wire reaches over with its foot and touches another wire. Why... Problem 102E: What does it mean to say that an electric appliance is grounded? Problem 103E: If a current of one- or two-tenths of an ampere were to pass into one of your hands and out the... Problem 104E: Consider a water pipe that branches into two smaller pipes. If the flow of water is 10 liters per... Problem 105E: Consider a circuit with a main wire that branches into two other wires. If the current is 10 amperes... Problem 106E: Are automobile headlights wired in parallel or in series? What is your evidence? Problem 107E: As more lanes are added to toll booths, the resistance to vehicles passing through is reduced. How... Problem 108E: (a) Which is the same for a 10- and a 20- resistor connected in series in a series circuit: current... Problem 109E: If several bulbs are connected in series to a battery, they may feel warm to the touch even though... Problem 110E: Which is less damaging: plugging a 110-V appliance into a 220-V circuit or plugging a 220-V... Problem 111E: What unit of measurement is meant by (a) joule per coulomb, (b) coulomb per second, and (c)... Problem 112E: What happens to the brightness of light emitted by a light bulb when the current in the filament... Problem 113E: Why are LED lamps more efficient than incandescent lamps? Problem 114E: Is it correct to say that the energy from a car battery ultimately comes from fuel in the gas tank?... Problem 115E: A cars headlight dissipates 40 W on low beam and 50 W on high beam. Is there more or less resistance... Problem 116DQ: The proportionality constant k in Coulombs law is huge in ordinary units, whereas the... Problem 117DQ: A friend says that the reason ones hair stands out while one is touching a charged Van de Graaff... Problem 118DQ: Your tutor tells you that an ampere and a volt really measure the same thing, and the different... Problem 119DQ: The circuit within an incandescent bulb is shown at the left. Which of the battery arrangements will... Problem 120DQ: In which of the following circuits does a current exist to light the bulb? Problem 121DQ: Does more current "flow" out of a battery than into it? Does more current "flow" into a light bulb... Problem 122DQ: Sometimes you hear someone say that a particular appliance "uses up" electricity. What is it that... Problem 123DQ: Does a lamp with a thick filament draw more current or less current than a lamp with a thin... Problem 124DQ: Is the current in a light bulb connected to a 220-V source greater or less than that in the same... Problem 125DQ: Is the following label on a household product cause for concern? "Caution: This product contains... Problem 126DQ: The equivalent resistance of a pair of resistors depends on how they're connected. Suppose you wish... Problem 127DQ: A friend says that a battery provides not a source of constant current, but a source of constant... Problem 128DQ: A friend says that adding bulbs in series to a circuit provides more obstacles to the flow of... Problem 129DQ: Consider a pair of flashlight bulbs connected to a battery. Do they glow brighter if they are... Problem 130DQ: In the circuit shown, how do the three identical light bulbs compare in brightness? Which light bulb... Problem 131DQ: As more and more bulbs are connected in series to a flashlight battery, what happens to the... Problem 132DQ: A battery has internal resistance, so when the current it supplies goes up, the voltage it supplies... Problem 133DQ: Are these circuits equivalent to one another? Why or why not? Problem 134DQ: Your friend says that electric current takes the path of least resistance. In the case of a parallel... Problem 135DQ: Consider a pair of incandescent bulbs, a 60-W bulb and a 100-W bulb. If the bulbs are connected in... Problem 1RAT: Choose the BEST answer to the question or the BEST way to complete the statement 1. When we say... Problem 2RAT: When a pair of charged particles are brought twice as close to each other, the force between them... Problem 3RAT: An electric field surrounds all (a) electrons. (b) protons. (c) both of these (d) neither of these Problem 4RAT: Electric potential and electric potential energy are (a) one and the same in most cases. (b) two... Problem 5RAT: Which statement(s) is(are) correct? (a) Voltage flows in a circuit. (b) Charge flows in a circuit.... Problem 6RAT: When you double the voltage in a simple electric circuit, you double the (a) current. (b)... Problem 7RAT: When you double both the current and the voltage in a circuit, the power (a) remains unchanged if... Problem 8RAT: In a simple circuit consisting of a single lamp and a single battery, when the current in the lamp... Problem 9RAT: In a circuit with two lamps in parallel, if the current in one lamp is 2 amperes (A), the current in... Problem 10RAT: What is the power rating of a lamp connected to a 12-V source when it carries 2.5 A? (a) 4.8 W (b)... format_list_bulleted