EP PHYSICS -MOD.MASTERING (18W)
5th Edition
ISBN: 9780136782490
Author: Walker
Publisher: PEARSON CO
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Textbook Question
Chapter 20, Problem 6CQ
Explain why equipotentials are always perpendicular to the electric field.
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EP PHYSICS -MOD.MASTERING (18W)
Ch. 20.1 - The electric potential in system A changes...Ch. 20.2 - Particle A accelerates from rest through a...Ch. 20.3 - The following systems consist or a point charge at...Ch. 20.4 - Figure 20-14 shows a series of equipotential...Ch. 20.5 - Two parallel-plate capacitors are identical,...Ch. 20.6 - The following systems consist of a capacitor for...Ch. 20 - In one region of space the electric potential has...Ch. 20 - If the electric field is zero in some region of...Ch. 20 - Sketch the equipotential surface that goes through...Ch. 20 - How much work is required to move a charge from...
Ch. 20 - It is known that the electric potential is...Ch. 20 - Explain why equipotentials are always...Ch. 20 - Two charges are at locations that have the same...Ch. 20 - A capacitor is connected to a battery and fully...Ch. 20 - On which of the following quantities does the...Ch. 20 - We say that a capacitor stores charge, yet the...Ch. 20 - An electron is released from rest in a region of...Ch. 20 - A uniform electric field of magnitude 3.8 105 N/C...Ch. 20 - A uniform electric field of magnitude 6.8 105 N/C...Ch. 20 - BIO Electric Potential Across a Cell Membrane In a...Ch. 20 - An old-fashioned computer monitor accelerates...Ch. 20 - A parallel-plate capacitor has plates separated by...Ch. 20 - When an ion accelerates through a potential...Ch. 20 - The Electric Potential of the Earth The Earth has...Ch. 20 - A uniform electric field with a magnitude of 6860...Ch. 20 - Predict/Calculate A spark plug in a car has...Ch. 20 - A uniform electric field with a magnitude of 1200...Ch. 20 - A Charged Battery A typical 12-V car battery can...Ch. 20 - BIO Predict/Calculate The Sodium Pump Living cells...Ch. 20 - Predict/Calculate The electric potential of a...Ch. 20 - Points A and B have electric potentials of 332 V...Ch. 20 - Predict/Explain An electron is released from rest...Ch. 20 - Calculate the speed of (a) a proton and (b) an...Ch. 20 - Ion Thrusters NASAs Deep Space 1 and Dawn...Ch. 20 - Find the potential difference required to...Ch. 20 - Predict/Calculate A particle with a mass of 3.8 g...Ch. 20 - Conduction Electrons In the microscopic view of...Ch. 20 - A proton has an initial speed of 5.5 105 m/s. (a)...Ch. 20 - In Figure 20-29, q1 = +1.8 nC and q2 = 2.1 nC, and...Ch. 20 - In Figure 20-29, it is given that, q1 = +Q. (a)...Ch. 20 - CE The charge q1 in Figure 20-29 has the value +Q....Ch. 20 - CE It is given that the electric potential is zero...Ch. 20 - The electric potential 1.6 m from a point charge q...Ch. 20 - A point charge of 9.2 C is at the origin. What is...Ch. 20 - The Bohr Atom The hydrogen atom consists of one...Ch. 20 - How far must the point charges q1 = +6.22 C and q2...Ch. 20 - Four different arrangements of point charges are...Ch. 20 - Predict/Calculate Point charges +4.1 C and 2.2C...Ch. 20 - In Figure 20-31, the charge q = 4.11 10-9C. (a)...Ch. 20 - Predict/Calculate In Figure 20-31, the charge q =...Ch. 20 - A charge of 4.07C is held fixed at the origin. A...Ch. 20 - Predict/Calculate A charge of 20.2 C is held fixed...Ch. 20 - A charge of 2.505 C is located at (3.055 m, 4.501...Ch. 20 - Predict/Calculate Figure 20-32 shows three charges...Ch. 20 - How much work must be done to move the three...Ch. 20 - (a) Find the electric potential at point P in...Ch. 20 - A square of side a has a charge +Q at each corner....Ch. 20 - A square of side a has charges +Q and Q...Ch. 20 - Predict/Explain (a) is the electric potential at...Ch. 20 - Predict/Explain Imagine sketching a large number...Ch. 20 - Two point charges are on the x axis. Charge 1 is...Ch. 20 - Figure 20-35 shows a series of equipotentials in a...Ch. 20 - Predict/Calculate Consider a region in space where...Ch. 20 - A given system has the equipotential surfaces...Ch. 20 - A given system has the equipotential surfaces...Ch. 20 - A 0.75-F capacitor is connected to a 9.0-V...Ch. 20 - It is desired that 7.7 C of charge be stored on...Ch. 20 - To operate a given flash lamp requires a charge of...Ch. 20 - Planet Capacitor It can be shown that the...Ch. 20 - A parallel-plate capacitor is made from two...Ch. 20 - A parallel-plate capacitor is constructed with...Ch. 20 - Predict/Calculate A parallel-plate capacitor has...Ch. 20 - Predict/Calculate A 72-nF parallel-plate capacitor...Ch. 20 - Predict/Calculate Consider a parallel-plate...Ch. 20 - A parallel-plate capacitor has plates of area 3.75...Ch. 20 - Predict/Calculate A parallel-plate capacitor...Ch. 20 - Suppose that after walking across a carpeted floor...Ch. 20 - (a) What plate area is required for an air-filled,...Ch. 20 - Lightning As a crude model for lightning, consider...Ch. 20 - A parallel-plate capacitor is made from two...Ch. 20 - Calculate the work done by a 9.0-V battery as it...Ch. 20 - BIO Defibrillator An automatic external...Ch. 20 - BIOPredict/Calculate Cell Membranes The membrane...Ch. 20 - A capacitor with plate area 0.0440 m2 and plate...Ch. 20 - Find the electric energy density between the...Ch. 20 - What electric field strength would store 17.5 J of...Ch. 20 - An electronic flash unit for a camera contains a...Ch. 20 - A parallel-plate capacitor has plates with an area...Ch. 20 - CE Predict/Explain A proton is released from rest...Ch. 20 - CE The plates of a parallel-plate capacitor have...Ch. 20 - CE A parallel-plate capacitor is connected to a...Ch. 20 - CE The plates of a parallel-plate capacitor have...Ch. 20 - CE A parallel-plate capacitor is connected to a...Ch. 20 - Find the difference in electric potential, V = VB ...Ch. 20 - A 0.32-F capacitor is charged by a 1.5-V battery....Ch. 20 - A charge of 22.5 C is located at (4.40 m, 6.22 m),...Ch. 20 - The Bohr Model In the Bohr model of the hydrogen...Ch. 20 - Predict/Calculate A +1.2-C charge and a 1.2-C...Ch. 20 - How much work is required to bring three protons,...Ch. 20 - A point charge Q = +87.1 C is held fixed at the...Ch. 20 - Electron Escape Speed An electron is at rest just...Ch. 20 - Quark Model of the Neutron According to the quark...Ch. 20 - A parallel-plate capacitor is charged to an...Ch. 20 - Predict/Calculate The three charges shown in...Ch. 20 - (a) In Figure 20-36 we see that the electric...Ch. 20 - BIO Predict/Calculate Electric Catfish The...Ch. 20 - Regenerative Braking Many electric cars can...Ch. 20 - Predict/Calculate Computer Keyboards Many computer...Ch. 20 - Predict/Calculate A point charge of mass 0.081 kg...Ch. 20 - BIO Cell Membranes and Dielectrics Many cells in...Ch. 20 - BIO Mitochondrial Membrane Every cell in the body...Ch. 20 - Long, long ago, on a planet far, far away, a...Ch. 20 - Rutherfords Planetary Model of the Atom In 1911,...Ch. 20 - Predict/Calculate (a) One of the Q charges in...Ch. 20 - Figure 20-38 shows a charge q = +6.77 C with a...Ch. 20 - The electric potential a distance r from a point...Ch. 20 - When the potential difference between the plates...Ch. 20 - The electric potential a distance r from a point...Ch. 20 - BIO The Electric Eel Of the many unique and...Ch. 20 - As a rough approximation, consider an electric eel...Ch. 20 - In terms of the parallel-plate model of the...Ch. 20 - How much energy is stored by an electric eel when...Ch. 20 - Predict/Calculate Referring to Example 20-9...Ch. 20 - Referring to Example 20-9 Suppose we can change...Ch. 20 - Predict/Calculate Referring to Example 20-9...
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- The labeled points in Figure 20.4 are on a series of equipotential surfaces associated with an electric field. Rank (from greatest to least) the work done by the electric field on a positively charged particle that moves from to , from to , from to , and from to . Figure 20.4 (Quick Quiz 20.2) Four equipotential surfaces.arrow_forwardSketch the equipotential lines in the vicinity of two opposite charges, where the negative charge is three times as great in magnitude as the positive. See Figure 19.28 for a similar situation. Indicate the direction of increasing potential.arrow_forwardSketch the equipotential lines a long distance from the charges shown in Figure 19.28. Indicate the direction of increasing potential. Figure 19.28 The electric field near two charges.arrow_forward
- The lesser electric ray (Narcine bancroftii) maintains an incredible charge on its head and a charge equal in magnitude but opposite in sign on its tail (Figure 19.32). (a) Sketch the equipotential lines surrounding the ray. (b) Sketch the equipotentials when the ray is near a ship with a conducting surface. (C) How could this charge distribution be of use to the ray? Figure 19.32 Lesser electric ray (Narcine bancroftii) (credit: National Oceanic and Atmospheric Administration, NOAAs Fisheries Collection).arrow_forwardFigure 19.28 shows the electric field lines near two charges q1and q2the first having a magnitude four times that of the second. Sketch the equipotential lines for these two charges, and indicate the direction of increasing potential.arrow_forwardExplain in your own words why equipotential lines and surfaces must be perpendicular to electric field lines.arrow_forward
- Two very large metal plates are placed 2.0 cm apart, with a potential difference of 12 V between them. Consider one plate to be at 12 V, and the other at 0 V. (a) Sketch the equipotential surfaces for 0, 4, 8, and 12 V. (b) Next sketch in some electric field lines, and confirm that they are perpendicular to the equipotential lines.arrow_forwardSketch the equipotential lines surrounding the two conducting plates shown in Figure 19.30, given the top plate is positive and the bottom plate has an equal amount of negative charge. Be certain to indicate the distribution of charge on the plates. Is the field strongest where the plates are closest? Why should it be? Figure 19.30arrow_forwardTwo Leyden jars are similar in size and shape, but one has glass as the dielectric and the other ebonite. The glass jar is charged, but when the charge is shared between the two jars (connected in parallel), the electric potential drops by 40% of its initial value. If the dielectric constant of glass is 3.0, find the dielectric constant of ebonite.arrow_forward
- When a Leyden jar is charged by a hand generator (Fig. 27.1, page 828), the work done by the person turning the crank is stored as electric potential energy in the jar. When a capacitor is charged by a battery, where does the electric potential energy come from?arrow_forwardA parallel-plate capacitor is charged and then is disconnected from the battery. By what factor does the stored energy change when the plate separation is then doubled? (a) It becomes four times larger. (b) It becomes two times larger. (c) It stays the same. (d) It becomes one-half as large. (e) It becomes one-fourth as large.arrow_forwardSketch the equipotential lines for the two equal positive charges shown in Figure 19.27. Indicate the direction of increasing potential. Figure 19.27 The electric field near two equal positive charges is directed away from each of the charges.arrow_forward
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