# akbar (mha868) 7 Magnetism 7 satyal 7 (PHYSI442004) 1 This printout should have 13 questions. Multiplechoice questions may continue on the next

I would like the answers to these problems worked out so I can understand them better

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akbar (mha868) 7 Magnetism 7 satyal 7 (PHYSI442004) 1 This print—out should have 13 questions.Multiple—choice questions may continue onthe next column or page 7 ﬁnd all choicesbefore answering. 001 10.0 pointsA small bar magnet pulls on a larger one witha force of 59 Newtons.What is the magnitude of the force thelarger one exerts on the smaller one?Answer in units of N. 002 10.0 points An electron in a vacuum is ﬁrst acceleratedby a voltage of 11000 V and then enters aregion in which there is a uniform magneticﬁeld of 0.629 T at right angles to the directionof the electron’s motion. The mass of the electron is 9.11 x 10‘31 kgand its charge is 1.60218 x 10‘19 o. What is the magnitude of the force on theelectron due to the magnetic ﬁeld? Answer in units of N. 003 10.0 pointsA magnetic ﬁeld can deﬂect a beam of elec—trons, but it cannot do work on the electrons to change their speed.Why? 1. A magnetic ﬁeld can do work on theelectrons to either increase or decrease the speed of the electrons; however, with time-averaging their speeds remain constant. 2. Moving electrons change the magneticﬁeld such that it cannot do work on the elec—trons. 3. The direction of a magnetic force is alwaysperpendicular to the velocity of an electron,so it cannot do work on the electron. 4. When a magnetic ﬁeld does work on theelectrons, the work is changed into light in—stead of increasing the energy of electrons. 004 10.0 points“An electron always experiences a force in an electric ﬁeld, but not always in a magneticﬁeld.” Defend this statement. 1. Sometimes a magnetic ﬁeld disappearswhen an electron is placed in it. 2. Away from the Earth an electron does notfeel any magnetic force. 3. An electron always has a charge in an electric ﬁeld, but not always in a magneticﬁeld. 4. If the velocity of an electron is greaterthan a critical value, a magnetic ﬁeld cannotexert any force on the electron. 5. An electric ﬁeld always acts on chargedparticles. The magnetic force vanishes whenthe velocity of the electron is parallel to themagnetic ﬁeld. 005 10.0 pointsWhat produces a magnetic ﬁeld? 1. A nonuniform but time-constant electricﬁeld 2. A massive object at rest3. A moving atom 4. A moving electric charge 006 (part 1 of 2) 10.0 pointsA 8.7 m wire carries a current of 7.0 A towardthe +9: direction. A magnetic force of 7.6 X10_6 N acts on wire in the 7y direction.a) Find the magnitude of the magnetic ﬁeldproducing the force.Answer in units of T. 007 (part 2 of 2) 10.0 pointsb) What is its direction? 1 . —y direction 2. +z direction

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