1 Temperature And Heat 2 The Kinetic Theory Of Gases 3 The First Law Of Thermodynamics 4 The Second Law Of Thermodynamics 5 Electric Charges And Fields 6 Gauss's Law 7 Electric Potential 8 Capacitance 9 Current And Resistance 10 Direct-current Circuits 11 Magnetic Forces And Fields 12 Sources Of Magnetic Fields 13 Electromagnetic Induction 14 Inductance 15 Alternating-current Circuits 16 Electromagnetic Waves Chapter11: Magnetic Forces And Fields
Chapter Questions Section: Chapter Questions
Problem 11.1CYU: Check Your Understanding Repeat the previous problem with the magnetic field in the x-direction... Problem 11.2CYU: Check Your Understanding A uniform magnetic field of magnitude 1.5 T is directed horizontally from... Problem 11.3CYU: Check Your Understanding A straight, flexible length of copper wire is immersed in a magnetic field... Problem 11.4CYU: Check Your Understanding In what orientation would a magnetic dipole have to be to produce (a) a... Problem 11.5CYU: Check Your Understanding A Hall people consists of a copper strip, n=8.51028 electrons per cubic... Problem 11.6CYU: Check Your Understanding A cyclotron is to be designed to accelerate protons to kinetic energies of... Problem 1CQ: Discuss the similarities and differences between the electrical force on a charge and the magnetic... Problem 2CQ: (a) Is it possible for the magnetic force on a charge moving in a magnetic field to be zero? (b) Is... Problem 3CQ: At a given instant, an electron and a proton are moving with the same velocity in a constant... Problem 4CQ: Does increasing the magnitude of a uniform magnetic field through which a charge is traveling... Problem 5CQ: An electron passes through a magnetic field without being deflected. What do you conclude about the... Problem 6CQ: If a charged particle moves in a straight line, can you conclude that there is no magnetic field... Problem 7CQ: How could you determine which pole of an electromagnet is north and which pole is south? Problem 8CQ: Describe the error that results from accidently using your left rather than your right hand when... Problem 9CQ: Considering the magnetic force law, are the velocity and magnetic field always perpendicular? Are... Problem 10CQ: Why can a nearby magnet distort a cathode ray tube television picture? Problem 11CQ: A magnetic field exerts a force on the moving electrons in a current carrying wire. What exerts the... Problem 12CQ: There are regions where the magnetic field of earth is almost perpendicular to the surface of Earth.... Problem 13CQ: Hall potentials are much larger for poor conductors than for good conductors. Why? Problem 14CQ: Describe the primary function of the electric field and the magnetic field in a cyclotron. Problem 15P: What is the direction of the magnetic force on a positive charge that moves as shown in each of the... Problem 16P: Repeat previous exercise for a negative charge. Problem 17P: What is the direction of the velocity of a negative charge that experiences the magnetic force shown... Problem 18P: Repeat previous exercise for a positive charge. Problem 19P: What is the direction of the magnetic field that produces the magnetic force on a positive charge as... Problem 20P: Repeat previous exercise for a negative charge. Problem 21P: (a) Aircraft sometimes acquire small static charges, Suppose a supersonic jet has a 0.500C charge... Problem 22P: (a) A cosmic ray proton moving toward Earth at 5.00107 m/s experiences a magnetic force of 1.70l0l6... Problem 23P: An electron moving at 4.00103 m/s in a 1.25-T magnetic field experiences a magnetic force of... Problem 24P: (a) A physicist performing a sensitive measurement wants to limit the magnetic force on a moving... Problem 25P: A cosmic-ray electron moves at 7.5 × 106 m/sinches perpendicular to Earth’s magnetic field at an... Problem 26P: (a) Viewers of Star Trek have heard of an antimatter drive on the Starship Enterprise. One... Problem 27P: (a) An oxygen-16 ion with a mass of 2.661026 kg travels at 5.0106 m/s perpendicular to a 1.20-T... Problem 28P: An electron in a TV CRT moves with a speed of 6.0107 m/s, in a direction perpendicular to Earth's... Problem 29P: (a) At what speed will a proton move in a circular path of the same radius as the electron in the... Problem 30P: (a) What voltage will accelerate electrons to a speed of 6.00107 m/s? (b) Find the radius of... Problem 31P: An alpha-particle ( m=6.641027kg , q=3.21019C ) travels in a circular path of radius 25 cm in a... Problem 32P: A particle of charge q and mass m is accelerated from rest through a potential difference V, after... Problem 33P: What is the direction of the magnetic force on the current in each of the six cases? Problem 34P: What is the direction of a current that experiences the magnetic force shown in each of the three... Problem 35P: What is the direction of the magnetic field that produces the magnetic force shown on the currents... Problem 36P: (a) What is the force per meter on a lightning bolt at the equator that carries 20,000 A... Problem 37P: (a) A dc power line for a light-rail system caries 1000 A at an angle of 30.0 to Earth's 5.0105 T... Problem 38P: A wire carrying a 30.0-A current passes between the poles of a strong magnet that is perpendicular... Problem 39P: (a) By how many percent is the torque of a motor decreased if its permanent magnets lose 5.0% of... Problem 40P: (a) What is the maximum torque on a 150-tum square loop of wire 13.0 cm oil a side that carries a... Problem 41P: Find the current through a loop needed to create a maximum torque of 9.0 N.m. The loop has 50 square... Problem 42P: Calculate the magnetic field strength needed on a 200-tum square loop 20.0 cm on a side to create a... Problem 43P: Since the equation for torque on a current-carrying loop is =NIABsin, the units of N .m must equal... Problem 44P: , (a) At what angle 0 is tlie torque on a current loop 90.0% of maximum? (b) 50.0% of maximum? (c)... Problem 45P: A proton has a magnetic field due to its spin. The field is similar to that created by a circular... Problem 46P: (a) A 200-turn circular loop of radius SO.0 cm is vertical, with its axis on an east-west line. A... Problem 47P: Repeat the previous problem, but with the loop lying flat on the ground with its current circulating... Problem 48P: A strip of copper is placed in a uniform magnetic field of magnitude 2.5 T. The Hall electric field... Problem 49P: The cross-sectional dimensions of the copper strip shown are 2.0 cm by 2.0 mm. The strip carries a... Problem 50P: The magnitudes of the electric and magnetic fields in a velocity selector are 1.8105V/m and 0.080 T,... Problem 51P: A charged particle moves through a velocity selector at constant velocity. In tire selector,... Problem 52P: A Hall probe gives a reading of 1.5V for a current of 2 A when it is placed in a magnetic field of 1... Problem 53P: A physicist is designing a cyclotron to accelerate protons to one-tenth the speed of light. The... Problem 54P: The strengths of the fields in the velocity selector of a Bainbridge mass spectrometer are B = 0.500... Problem 55P: The magnetic field in a cyclotron is 1.25 T, and the maximum orbital radius of the circulating... Problem 56P: A mass spectrometer is being used to separate common oxygen- 16 from the much rarer oxygen-18, taken... Problem 57P: (a) Triply charged uranium-235 and uranium-238 ions are being separated in a mass spectrometer. (The... Problem 58AP: Calculate the magnetic force on a hypothetical particle of charge 1.010l9C moving with a velocity of... Problem 59AP: Repeat the previous problem with a new magnetic field of (0.4i+1.2k)T . Problem 60AP: An electron is projected into a uniform magnetic field (0.5i+0.8k)T with a velocity of... Problem 61AP: The mass and chaise of a water droplet are 1.0104g and 2.0108C , respectively. If the droplet is... Problem 62AP: Four different proton velocities are given. For each case, determine the magnetic force on the... Problem 63AP: An electron of kinetic energy 2000 eV passes between parallel plates that are 1.0 an apart and kept... Problem 64AP: An alpha-particle (m=6.641027kg,q=3.21019C) moving with a velocity v=(2.0i4.0k)106m/s enters a... Problem 65AP: An electron moving with a velocity v=(4.0i+3.0j+2.0k)106m/s enters a region where there is a uniform... Problem 66AP: At a particular instant an electron is traveling west to east with a kinetic energy of 10 keV.... Problem 67AP: Repeat the calculations of the previous problem for a proton with the same kinetic energy. Problem 68AP: What magnetic field is required in order to confine a proton moving with a speed of 4.0 × 106 m/s to... Problem 69AP: An electron and a proton move with the same speed in a plane perpendicular to a uniform magnetic... Problem 70AP: A proton and an alpha-particle have the same kinetic energy and both move in a plane perpendicular... Problem 71AP: A singly charged ion takes 2.0 × 10-3 s to complete eaglet revolutions in a uniform magnetic field... Problem 72AP: A particle moving downward at a speed of 6.0106 m/s enters a uniform magnetic field that is... Problem 73AP: , A proton, deuteron, and an alpha-particle ae all accelerated from rest through the same potential... Problem 74AP: A singly charged ion is moving in a uniform magnetic field of 7.5102 T completes 10 revolutions in... Problem 75AP: Two particles have the same linear momentum, but particle A has four times the charge of particle B.... Problem 76AP: A uniform magnetic field of magnitude is directed parallel to the z-axis. A proton enters the field... Problem 77AP: An electron moving along the +x -axis at 5.0106m/s enters a magnetic field that makes a 75° angle... Problem 78AP: (a) A 0.750-m-long section of cable carrying current to a car starter motor makes an angle of GOP... Problem 79AP: (a)What is the angle between a wire carrying an 8.00-A current and the 1.20-T field It Is in if 50.0... Problem 80AP: A 1.0-rn-long segment of wire lies along the x-axis and carries a current of 2.0 A in the positive... Problem 81AP: A 5.0-m section of a long, straight wire carries a current of 10 A while in a uniform magnetic field... Problem 82AP: An electromagnet produces a magnetic field of magnitude 1.5 T throughout a cylindrical region of... Problem 83AP: The current loop shown in the accompanying figure lies in the plane of the page, as does the... Problem 84AP: A circular coil of radius 5.0 cm is wound with five turns and carries a current of 5.0 A. If the... Problem 85AP: Acircularcoiofwireofradius5.Ocmhas2Otums and carries a current of 2.0 A. The coil lies in a magnetic... Problem 86AP: A current-carrying coil in a magnetic field experiences a torque that is 75% of the maximum possible... Problem 87AP: A 40-cm by 6.0-cm rectangular current loop carries a current of 10 A. What Is the magnetic dipole... Problem 88AP: A circular coil with 200 turns Las a radius of 2.0 cm. (a) What current through tire coil results in... Problem 89AP: The current through a circular wire loop of radius 10 cm is 5.0 A. (a) Calculate themagnetic dipole... Problem 90AP: A wire of length 1.0 m is wound into a single-turn planar loop. The loop carries a current of 5.0 A,... Problem 91AP: Consider an electron rotating in a circular orbit of radius r. Show that the magnitudes of the... Problem 92AP: The Hall effect is to be used to find the sign of charge carries in a semiconductor sample. The... Problem 93AP: The density of charge carriers far copper is 8.471028 electrons per cubic meter. What will be the... Problem 94AP: The Hall effect is to be used to find the density of charge carriers in an unknown material. A Hall... Problem 95AP: Show tliat the Hall voltage across wires made of the same material, carrying identical currents, and... Problem 96AP: A velocity selector in a mass spectrometer uses a 0.100-T magnetic field, (a) What electric field... Problem 97AP: Find the radius of curvature of the path of a 25.0-MeV proton moving peipendicularly to the 1,20-T... Problem 98AP: Unreasonable results To construct a non-mechanical water meter, a 0.500-T magnetic field is placed... Problem 99AP: Unreasonable results A charged particle having mass 6.641027kg (that of a helium atom) moving at... Problem 100AP: Unreasonable results An inventor wants to generate 120-V power by moving a 1.00-m-long wire... Problem 101AP: Unreasonable results Frustrated by the small Hall voltage obtained in blood flow measurements, a... Problem 102CP: A particle of charge +q and mass m moves with velocity v0 pointed In the +y-direction as It crosses... Problem 103CP: A proton of speed v=6105m/s enters a region of uniform magnetic field of B = 0.5 T at an angle of q... Problem 104CP: A particle’s path is bent when it passes through a region of non-zero magnetic field although its... Problem 105CP: In a region a non-uniform magnetic field exists such that Bx=0,By=0,andBz=ax where a is a Constant.... Problem 106CP: A copper rod of mass in and length L is hung from the ceiling using two springs of spring constant... Problem 107CP: The accompanied figure shows an arrangement for measuring mass of ions by an instrument called the... Problem 108CP: A wire ismade into a circular shape of radius R and pivoted along a central support.The two ends of... Problem 109CP: A long-rigid wire lies along the x-axis and cairns a current of 2.5 A in the positive x-direction.... Problem 110CP: A circular loop of wire of area 10 cm2 carries a current of 25 A. At a particular instant, the loop... Problem 68AP: What magnetic field is required in order to confine a proton moving with a speed of 4.0 × 106 m/s to...
Related questions
An electron in a magnetic field moves along a circle with a radius of 27.4 m with a speed that follows:
v(t)=v_0e^(−bt)
where b = 0.55 s-1 and v_0 = 140 m/s. Find the following:
The angular acceleration at t = 3.7 seconds.
Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .
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