Pearson eText Conceptual Physical Science -- Instant Access (Pearson+)
6th Edition
ISBN: 9780134857107
Author: Paul Hewitt, John Suchocki
Publisher: PEARSON+
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Textbook Question
Chapter 8, Problem 15RCQ
What condition is necessary for a sustained flow of electric charge through a
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1. A charge of -25 μC is distributed uniformly throughout a spherical volume of radius 11.5 cm.
Determine the electric field due to this charge at a distance of (a) 2 cm, (b) 4.6 cm, and (c) 25 cm from
the center of the sphere.
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A long silver rod of radius 3.5 cm has a charge of -3.9
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(a) Find the electric field at a point 5 cm from the center of the rod (an outside point).
E =
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(b) Find the electric field at a point 1.8 cm from the center of the rod (an inside point)
E=0
Think & Prepare
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1. Is there a symmetry in the charge distribution? What kind of symmetry?
2. The problem gives the charge per unit length 1. How do you figure out the surface charge density σ
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1. Determine the electric flux through each surface whose cross-section is shown below.
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(f) Sa
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-29
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Chapter 8 Solutions
Pearson eText Conceptual Physical Science -- Instant Access (Pearson+)
Ch. 8 - Which part of an atom is positively charged, anti...Ch. 8 - How does the charge of one electron compare with...Ch. 8 - How do the masses of electrons compare with the...Ch. 8 - Prob. 4RCQCh. 8 - What kind of charge does an object acquire when...Ch. 8 - What is meant by saying that charge is conserved?Ch. 8 - How is Coulomb's law similar to Newton's law of...Ch. 8 - How does a coulomb of charge compare with the...Ch. 8 - How does the magnitude of electrical force between...Ch. 8 - How does an electrically polarized object differ...
Ch. 8 - Give two examples of common force fields.Ch. 8 - How is the direction of an electric field defined?Ch. 8 - In terms of the units that measure them,...Ch. 8 - A balloon may easily be charged to several...Ch. 8 - What condition is necessary for a sustained flow...Ch. 8 - How much energy is given to each coulomb of charge...Ch. 8 - Does electric charge flow across a circuit or...Ch. 8 - Distinguish between dc and ac.Ch. 8 - Does a battery produce dc or ac? Does the...Ch. 8 - Which has the greater resistance, a thick wire or...Ch. 8 - What is the unit of electrical resistance?Ch. 8 - What is the effect on current through a circuit of...Ch. 8 - Which has the greater electrical resistance, wet...Ch. 8 - What is the function of the third prong on the...Ch. 8 - What is the source of electrons that produces a...Ch. 8 - In a circuit consisting of two lamps connected in...Ch. 8 - If 6 V were impressed across the circuit in...Ch. 8 - How does the total current through the branches of...Ch. 8 - As more lanes are opened at a fast-food...Ch. 8 - What is the relationship among electric power,...Ch. 8 - Coulombs Law: F=kq1q2d2 35. Two point charges,...Ch. 8 - A toaster has a heating element of 15 and is...Ch. 8 - Show that when you touch your wet fingers...Ch. 8 - Calculate the current in the 240- filament of a...Ch. 8 - An electric toy draw 0.5 A from a 120-V outlet....Ch. 8 - Calculate the power of a hair dryer that operates...Ch. 8 - Two pellets, each with a charge of 1 microcoulomb...Ch. 8 - Two point changes are separated by 4 cm. The...Ch. 8 - Show that if the charges attracting each other in...Ch. 8 - A droplet of ink in an industrial ink-jet printer...Ch. 8 - A 12-V battery moves 4 C of charge from one...Ch. 8 - Suppose you could expend 10 joules of work to push...Ch. 8 - The potential difference between a storm cloud and...Ch. 8 - The power in watts marked on a light bulb is not...Ch. 8 - Rearrange the formula Current = voltage/resistance...Ch. 8 - Using the formula Power = current voltage, show...Ch. 8 - A dehumidifier with a resistance of 20 draws 6.0...Ch. 8 - An electric space heater dissipates 1320 W of...Ch. 8 - The total charge that an automobile battery can...Ch. 8 - Show that it costs 7 cents to operate a 25-W porch...Ch. 8 - Suppose you operate a 100-W lamp continuously for...Ch. 8 - An electric dryer connected to a 120-V source...Ch. 8 - For the electric dryer of the previous problem,...Ch. 8 - An incandescent light bulb with an operating...Ch. 8 - In periods of peak demand, power companies lower...Ch. 8 - The three pairs of same-size metal spheres have...Ch. 8 - Rank, from brightest to dimmest, the identical...Ch. 8 - The bulbs are identical. Ammeters are placed in...Ch. 8 - All bulbs, are identical in the circuits. An...Ch. 8 - All bulbs are identical in the circuits. A...Ch. 8 - Consider the three parts of the circuit. First...Ch. 8 - At the atomic level, what is meant by saying...Ch. 8 - Why is charge usually transferred by electrons...Ch. 8 - Why are objects with vast numbers of electrons...Ch. 8 - If you scuff electrons from your shoes while...Ch. 8 - Why do clothes often cling together after tumbling...Ch. 8 - An electroscope is a simple device consisting of a...Ch. 8 - The leaves of a changed electroscope collapse in...Ch. 8 - If electrons were positive and protons were...Ch. 8 - When you double the distance between a pair of...Ch. 8 - When you double the charge on only one of a pair...Ch. 8 - When you double the charge on both particles in a...Ch. 8 - If you rub an inflated balloon against your hair...Ch. 8 - If you rub an inflated balloon against your hair...Ch. 8 - When a car is moved into a painting chamber, a...Ch. 8 - By what specific means do the bits of fine threads...Ch. 8 - Suppose that the strength of the electric field...Ch. 8 - Suppose an investigator places first a free...Ch. 8 - Why is voltage often referred to as an electric...Ch. 8 - Why might the wingspans of birds be a...Ch. 8 - One example of a water system is a garden hose...Ch. 8 - How is a hydraulic pump that produces sustained...Ch. 8 - What is the difference between electric potential...Ch. 8 - Why is a good conductor of electricity also a good...Ch. 8 - Which travels at nearly the speed of light in an...Ch. 8 - Which flows through an electric circuit: voltage,...Ch. 8 - Would you expect to find dc or ac in the filament...Ch. 8 - Comment on the warning sign in the sketch.Ch. 8 - Which has the higher resistance: a lamp filament...Ch. 8 - Only a small percentage of the electric energy...Ch. 8 - What is the effect on the current in a wire if...Ch. 8 - Why is a bird perched on a high-voltage wire safe,...Ch. 8 - Say the bird perched on a high-voltage wire...Ch. 8 - What does it mean to say that an electric...Ch. 8 - If a current of one- or two-tenths of an ampere...Ch. 8 - Consider a water pipe that branches into two...Ch. 8 - Consider a circuit with a main wire that branches...Ch. 8 - Are automobile headlights wired in parallel or in...Ch. 8 - As more lanes are added to toll booths, the...Ch. 8 - (a) Which is the same for a 10- and a 20- resistor...Ch. 8 - If several bulbs are connected in series to a...Ch. 8 - Which is less damaging: plugging a 110-V appliance...Ch. 8 - What unit of measurement is meant by (a) joule per...Ch. 8 - What happens to the brightness of light emitted by...Ch. 8 - Why are LED lamps more efficient than incandescent...Ch. 8 - Is it correct to say that the energy from a car...Ch. 8 - A cars headlight dissipates 40 W on low beam and...Ch. 8 - The proportionality constant k in Coulombs law is...Ch. 8 - A friend says that the reason ones hair stands out...Ch. 8 - Your tutor tells you that an ampere and a volt...Ch. 8 - The circuit within an incandescent bulb is shown...Ch. 8 - In which of the following circuits does a current...Ch. 8 - Does more current "flow" out of a battery than...Ch. 8 - Sometimes you hear someone say that a particular...Ch. 8 - Does a lamp with a thick filament draw more...Ch. 8 - Is the current in a light bulb connected to a...Ch. 8 - Is the following label on a household product...Ch. 8 - The equivalent resistance of a pair of resistors...Ch. 8 - A friend says that a battery provides not a source...Ch. 8 - A friend says that adding bulbs in series to a...Ch. 8 - Consider a pair of flashlight bulbs connected to a...Ch. 8 - In the circuit shown, how do the three identical...Ch. 8 - As more and more bulbs are connected in series to...Ch. 8 - A battery has internal resistance, so when the...Ch. 8 - Are these circuits equivalent to one another? Why...Ch. 8 - Your friend says that electric current takes the...Ch. 8 - Consider a pair of incandescent bulbs, a 60-W bulb...Ch. 8 - Choose the BEST answer to the question or the BEST...Ch. 8 - When a pair of charged particles are brought twice...Ch. 8 - An electric field surrounds all (a) electrons. (b)...Ch. 8 - Electric potential and electric potential energy...Ch. 8 - Which statement(s) is(are) correct? (a) Voltage...Ch. 8 - When you double the voltage in a simple electric...Ch. 8 - When you double both the current and the voltage...Ch. 8 - In a simple circuit consisting of a single lamp...Ch. 8 - In a circuit with two lamps in parallel, if the...Ch. 8 - What is the power rating of a lamp connected to a...
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