College Physics (10th Edition)
10th Edition
ISBN: 9780321902788
Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain
Publisher: PEARSON
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Textbook Question
Chapter 18, Problem 17P
An electron is to be accelerated from 3.00 × 108 m/s to 8.00 × 108 m/s. Through what potential difference must the electron pass to accomplish this? (b) through what potential difference must the electron pass it if is to be slowed from 8 00 × 108 m/s to a halt?
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In large CRT televisions, electrons are accelerated from rest by a potential difference of 23.88 kV
and shot onto a phosphorescent screen to produce an image. What is the speed of the electrons
when they reach the screen? (g. = 1.602 x 10-19C ;me = 9.11 x 10
-31
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Answer:
x10' m (express your answers in tenths place or one decimal digit only)
Suppose an electron (q = - e= - 1.6 x 10-19 C.m = 9.1 x 10-31 kg) is accelerated from rest through a potential
difference of Vab = +5000 V. Solve for the final speed of the electron. Express numerical answer in two significant figures.
The potential energy U is related to the electron charge (-e) and potential Vab is related by the equation:
U =
Assuming all potential energy U is converted to kinetic energy K,
K+U= 0
K= -U
1
Since K=mv and using the formula for potential energy above, we arrive at an equation for speed:
1/2
Plugging in values, the value of the electron's speed is:
x 107 m/s
V=
Suppose an electron (q= -e= -1.6 x 10-19 C,m=9.1x 10-31 kg) is accelerated from rest through a potential difference of Vab = +5000 V. Solve for
the final speed of the electron. Express numerical answer in two significant figures.
The potential energy U is related to the electron charge (-e) and potential Vab is related by the equation:
U =
Assuming all potential energy U is converted to kinetic energy K,
K +U = 0
K = -U
Since K-
and using the formula for potential energy above, we arrive at an equation for speed:
v = (
51/2
Plugging in values, the value of the electron's speed is:
V=
x 107 m/s
Chapter 18 Solutions
College Physics (10th Edition)
Ch. 18 - Why must electric field lines be perpendicular to...Ch. 18 - Which way do electric field lines point, from high...Ch. 18 - If the electric field is zero throughout a certain...Ch. 18 - The potential (relative to a point at infinity)...Ch. 18 - A capacitor is charged by being connected to a...Ch. 18 - A capacitor is charged by being connected to a...Ch. 18 - Two parallel-plate capacitors, identical except...Ch. 18 - The two plates of a capacitor are given charges Q,...Ch. 18 - Liquid dielectrics having polar molecules (such as...Ch. 18 - To store the maximum amount of energy in a...
Ch. 18 - You have two capacitors and want to connect them...Ch. 18 - You have three capacitors, not necessarily equal,...Ch. 18 - A surface will be an equipotential surface if...Ch. 18 - In Figure 18.31, point P is equidistant from both...Ch. 18 - For the capacitor network shown in Figure 18.32, a...Ch. 18 - Two charges are placed on the x axis. A charge of...Ch. 18 - Two point charges with charge +q are initially...Ch. 18 - If the potential (relative to infinity) due to a...Ch. 18 - If the electric potential energy of two point...Ch. 18 - An electron is released between the plates of a...Ch. 18 - The plates of a parallel-plate capacitor are...Ch. 18 - When a certain capacitor carries charge of...Ch. 18 - Two large metal plates carry equal and opposite...Ch. 18 - The electric potential (relative to infinity) due...Ch. 18 - A charge of 28.0 nC is placed in a uniform...Ch. 18 - Two very large charged parallel metal plates are...Ch. 18 - How far from a 7.20 C point charge must a +2.30 C...Ch. 18 - A point charge q1 = +2 40 C is held stationary at...Ch. 18 - Two stationary point charges of +3.00 nC and +2.00...Ch. 18 - A set of point charges is held in place at the...Ch. 18 - Three equal 1.20 C point charges are placed at the...Ch. 18 - When two point charges are a distance R apart,...Ch. 18 - Two large metal parallel plates carry opposite...Ch. 18 - A potential difference of 4.75 kV is established...Ch. 18 - BIO Axons. Neurons are the basic units of the...Ch. 18 - BIO Electrical sensitivity of sharks. Certain...Ch. 18 - A particle with a charge of +4 20 nC is in a...Ch. 18 - Two very large metal parallel plates are 20.0 cm...Ch. 18 - A uniform electric field has magnitude E and is...Ch. 18 - A point charge is sitting at the origin. The...Ch. 18 - An electron is to be accelerated from 3.00 108...Ch. 18 - A small particle has charge 5.00 C and mass 2.00 ...Ch. 18 - Two point charges q1 = +2.40 nC and q2 = 6.50 nC...Ch. 18 - A point charge Q = +4.00 C is held fixed al the...Ch. 18 - Two protons are released from rest when they are...Ch. 18 - x-ray tube. An x-ray tube is an evacuated glass...Ch. 18 - A parallel-plate capacitor having plates 6.0 cm...Ch. 18 - Two very large metal parallel plates that are 25...Ch. 18 - (a) A +5.00 C charge is located on a sheet of...Ch. 18 - A +1.50 C point charge is sitting at the origin....Ch. 18 - Dipole. A dipole is located on a sheet of paper....Ch. 18 - (a) You find that if you place charges of 1.25 C...Ch. 18 - The plates of a parallel-plate capacitor are 3.28...Ch. 18 - The plates of a parallel-plate capacitor are 2.50...Ch. 18 - A parallel-plate air capacitor has a capacitance...Ch. 18 - Suppose you were to design a 1 F parallel-plate...Ch. 18 - A 10.0 F parallel-plate capacitor with circular...Ch. 18 - A 10.0 F parallel-plate capacitor is connected to...Ch. 18 - You make a capacitor by cutting the...Ch. 18 - A 5.00 pF parallel-plate air-filled capacitor with...Ch. 18 - A disk-shaped parallel-plate capacitor has a...Ch. 18 - A parallel-plate capacitor C is charged up to a...Ch. 18 - For the system of capacitors shown in Figure...Ch. 18 - Electric eels. Electric eels and electric fish...Ch. 18 - In Figure 18.39, C1 = 6.00 f, C2 = 3.00 F. and C3...Ch. 18 - You are working on an electronics pro.ect that...Ch. 18 - In Figure 18 39, C1 = 3.00 F anri Vab = 120 V. The...Ch. 18 - A 4.00 F and a 6.00 F capacitor are wired in...Ch. 18 - In the circuit shown in Figure 18.40, the...Ch. 18 - In Figure 18.41 each capacitor has C = 4.00 f and...Ch. 18 - Figure 18.42 shows a system of four capacitors...Ch. 18 - For the system of capacitors shown in Figure...Ch. 18 - How much charge does a 12 V battery have to supply...Ch. 18 - A 5.80 F parallel-plate air capacitor has a plate...Ch. 18 - (a) How much charge does a battery have to supply...Ch. 18 - In the text, it was shown that the energy stored...Ch. 18 - A parallel-plate vacuum capacitor has 8.38 J of...Ch. 18 - A 5.00 nF parallel-plate capacitor contains 25.0 J...Ch. 18 - For the capacitor network shown in Figure 18.44,...Ch. 18 - For the capacitor network shown in Figure 18.45,...Ch. 18 - For the capacitor network shown in Figure 18.46,...Ch. 18 - A parallel-plate air capacitor has a capacitance...Ch. 18 - Cell membranes. Cell membranes (the walled...Ch. 18 - A parallel-plate capacitor is to be constructed by...Ch. 18 - A 12.5 F capacitor is connected to a power supply...Ch. 18 - The paper dielectric in a paper-and-foil capacitor...Ch. 18 - A constant potential difference of 12 V is...Ch. 18 - (a) If a spherical raindrop of radius 0.650 mm...Ch. 18 - At a certain distance from a point charge, the...Ch. 18 - Two oppositely charged identical insulating...Ch. 18 - A positive point charge Q is placed at a position...Ch. 18 - An alpha particle with a kinetic energy of 10.0...Ch. 18 - In the Bohr model of the hydrogen atom, a single...Ch. 18 - A proton and an alpha particle are released from...Ch. 18 - A parallel-plate air capacitor is made from two...Ch. 18 - In the previous problem, suppose the battery...Ch. 18 - A capacitor consists of two parallel plates, each...Ch. 18 - Electronic flash units for cameras contain a...Ch. 18 - In Figure 18.49, each capacitance C1 is 6.9 F and...Ch. 18 - Prob. 76PPCh. 18 - A helium ion (He++) that comes within about 10 fm...Ch. 18 - The maximum voltage at the center of a typical...Ch. 18 - How many moles of Na+ must move per unit area of...Ch. 18 - Prob. 80PPCh. 18 - Suppose that the change in Vm was caused by the...Ch. 18 - What is the minimum amount of work that must be...
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