University Physics Volume 2
18th Edition
ISBN: 9781938168161
Author: OpenStax
Publisher: OpenStax
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Textbook Question
Chapter 11, Problem 21P
(a) Aircraft sometimes acquire small static charges, Suppose a supersonic jet has a
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4.) The diagram shows the electric field lines of a positively charged conducting sphere of
radius R and charge Q.
A
B
Points A and B are located on the same field line.
A proton is placed at A and released from rest. The magnitude of the work done by the electric field in
moving the proton from A to B is 1.7×10-16 J. Point A is at a distance of 5.0×10-2m from the centre of
the sphere. Point B is at a distance of 1.0×10-1 m from the centre of the sphere.
(a) Explain why the electric potential decreases from A to B. [2]
(b) Draw, on the axes, the variation of electric potential V with distance r from the centre of the
sphere.
R
[2]
(c(i)) Calculate the electric potential difference between points A and B. [1]
(c(ii)) Determine the charge Q of the sphere. [2]
(d) The concept of potential is also used in the context of gravitational fields. Suggest why scientists
developed a common terminology to describe different types of fields. [1]
3.) The graph shows how current I varies with potential difference V across a component X.
904
80-
70-
60-
50-
I/MA
40-
30-
20-
10-
0+
0
0.5
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VIV
Component X and a cell of negligible internal resistance are placed in a circuit.
A variable resistor R is connected in series with component X. The ammeter reads 20mA.
4.0V
4.0V
Component X and the cell are now placed in a potential divider circuit.
(a) Outline why component X is considered non-ohmic. [1]
(b(i)) Determine the resistance of the variable resistor. [3]
(b(ii)) Calculate the power dissipated in the circuit. [1]
(c(i)) State the range of current that the ammeter can measure as the slider S of the potential divider
is moved from Q to P. [1]
(c(ii)) Describe, by reference to your answer for (c)(i), the advantage of the potential divider
arrangement over the arrangement in (b).
Chapter 11 Solutions
University Physics Volume 2
Ch. 11 - Check Your Understanding Repeat the previous...Ch. 11 - Check Your Understanding A uniform magnetic field...Ch. 11 - Check Your Understanding A straight, flexible...Ch. 11 - Check Your Understanding In what orientation would...Ch. 11 - Check Your Understanding A Hall people consists of...Ch. 11 - Check Your Understanding A cyclotron is to be...Ch. 11 - Discuss the similarities and differences between...Ch. 11 - (a) Is it possible for the magnetic force on a...Ch. 11 - At a given instant, an electron and a proton are...Ch. 11 - Does increasing the magnitude of a uniform...
Ch. 11 - An electron passes through a magnetic field...Ch. 11 - If a charged particle moves in a straight line,...Ch. 11 - How could you determine which pole of an...Ch. 11 - Describe the error that results from accidently...Ch. 11 - Considering the magnetic force law, are the...Ch. 11 - Why can a nearby magnet distort a cathode ray tube...Ch. 11 - A magnetic field exerts a force on the moving...Ch. 11 - There are regions where the magnetic field of...Ch. 11 - Hall potentials are much larger for poor...Ch. 11 - Describe the primary function of the electric...Ch. 11 - What is the direction of the magnetic force on a...Ch. 11 - Repeat previous exercise for a negative charge.Ch. 11 - What is the direction of the velocity of a...Ch. 11 - Repeat previous exercise for a positive charge.Ch. 11 - What is the direction of the magnetic field that...Ch. 11 - Repeat previous exercise for a negative charge.Ch. 11 - (a) Aircraft sometimes acquire small static...Ch. 11 - (a) A cosmic ray proton moving toward Earth at...Ch. 11 - An electron moving at 4.00103 m/s in a 1.25-T...Ch. 11 - (a) A physicist performing a sensitive measurement...Ch. 11 - A cosmic-ray electron moves at 7.5 × 106 m/sinches...Ch. 11 - (a) Viewers of Star Trek have heard of an...Ch. 11 - (a) An oxygen-16 ion with a mass of 2.661026 kg...Ch. 11 - An electron in a TV CRT moves with a speed of...Ch. 11 - (a) At what speed will a proton move in a circular...Ch. 11 - (a) What voltage will accelerate electrons to a...Ch. 11 - An alpha-particle ( m=6.641027kg , q=3.21019C )...Ch. 11 - A particle of charge q and mass m is accelerated...Ch. 11 - What is the direction of the magnetic force on the...Ch. 11 - What is the direction of a current that...Ch. 11 - What is the direction of the magnetic field that...Ch. 11 - (a) What is the force per meter on a lightning...Ch. 11 - (a) A dc power line for a light-rail system caries...Ch. 11 - A wire carrying a 30.0-A current passes between...Ch. 11 - (a) By how many percent is the torque of a motor...Ch. 11 - (a) What is the maximum torque on a 150-tum square...Ch. 11 - Find the current through a loop needed to create a...Ch. 11 - Calculate the magnetic field strength needed on a...Ch. 11 - Since the equation for torque on a...Ch. 11 - , (a) At what angle 0 is tlie torque on a current...Ch. 11 - A proton has a magnetic field due to its spin. The...Ch. 11 - (a) A 200-turn circular loop of radius SO.0 cm is...Ch. 11 - Repeat the previous problem, but with the loop...Ch. 11 - A strip of copper is placed in a uniform magnetic...Ch. 11 - The cross-sectional dimensions of the copper strip...Ch. 11 - The magnitudes of the electric and magnetic fields...Ch. 11 - A charged particle moves through a velocity...Ch. 11 - A Hall probe gives a reading of 1.5V for a current...Ch. 11 - A physicist is designing a cyclotron to accelerate...Ch. 11 - The strengths of the fields in the velocity...Ch. 11 - The magnetic field in a cyclotron is 1.25 T, and...Ch. 11 - A mass spectrometer is being used to separate...Ch. 11 - (a) Triply charged uranium-235 and uranium-238...Ch. 11 - Calculate the magnetic force on a hypothetical...Ch. 11 - Repeat the previous problem with a new magnetic...Ch. 11 - An electron is projected into a uniform magnetic...Ch. 11 - The mass and chaise of a water droplet are 1.0104g...Ch. 11 - Four different proton velocities are given. For...Ch. 11 - An electron of kinetic energy 2000 eV passes...Ch. 11 - An alpha-particle (m=6.641027kg,q=3.21019C) moving...Ch. 11 - An electron moving with a velocity...Ch. 11 - At a particular instant an electron is traveling...Ch. 11 - Repeat the calculations of the previous problem...Ch. 11 - What magnetic field is required in order to...Ch. 11 - An electron and a proton move with the same speed...Ch. 11 - A proton and an alpha-particle have the same...Ch. 11 - A singly charged ion takes 2.0 × 10-3 s to...Ch. 11 - A particle moving downward at a speed of 6.0106...Ch. 11 - , A proton, deuteron, and an alpha-particle ae all...Ch. 11 - A singly charged ion is moving in a uniform...Ch. 11 - Two particles have the same linear momentum, but...Ch. 11 - A uniform magnetic field of magnitude is directed...Ch. 11 - An electron moving along the +x -axis at 5.0106m/s...Ch. 11 - (a) A 0.750-m-long section of cable carrying...Ch. 11 - (a)What is the angle between a wire carrying an...Ch. 11 - A 1.0-rn-long segment of wire lies along the...Ch. 11 - A 5.0-m section of a long, straight wire carries a...Ch. 11 - An electromagnet produces a magnetic field of...Ch. 11 - The current loop shown in the accompanying figure...Ch. 11 - A circular coil of radius 5.0 cm is wound with...Ch. 11 - Acircularcoiofwireofradius5.Ocmhas2Otums and...Ch. 11 - A current-carrying coil in a magnetic field...Ch. 11 - A 40-cm by 6.0-cm rectangular current loop carries...Ch. 11 - A circular coil with 200 turns Las a radius of 2.0...Ch. 11 - The current through a circular wire loop of radius...Ch. 11 - A wire of length 1.0 m is wound into a single-turn...Ch. 11 - Consider an electron rotating in a circular orbit...Ch. 11 - The Hall effect is to be used to find the sign of...Ch. 11 - The density of charge carriers far copper is...Ch. 11 - The Hall effect is to be used to find the density...Ch. 11 - Show tliat the Hall voltage across wires made of...Ch. 11 - A velocity selector in a mass spectrometer uses a...Ch. 11 - Find the radius of curvature of the path of a...Ch. 11 - Unreasonable results To construct a non-mechanical...Ch. 11 - Unreasonable results A charged particle having...Ch. 11 - Unreasonable results An inventor wants to generate...Ch. 11 - Unreasonable results Frustrated by the small Hall...Ch. 11 - A particle of charge +q and mass m moves with...Ch. 11 - A proton of speed v=6105m/s enters a region of...Ch. 11 - A particle’s path is bent when it passes through a...Ch. 11 - In a region a non-uniform magnetic field exists...Ch. 11 - A copper rod of mass in and length L is hung from...Ch. 11 - The accompanied figure shows an arrangement for...Ch. 11 - A wire ismade into a circular shape of radius R...Ch. 11 - A long-rigid wire lies along the x-axis and cairns...Ch. 11 - A circular loop of wire of area 10 cm2 carries a...
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