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# MAGNETISM ANSWERS - PHYSICS 212 CHAPTER 19 MAGNETISM...

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-1- PHYSICS 212 CHAPTER 19 MAGNETISM WORKBOOK ANSWERS

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-2- PHYSICS 212 OUTLINE MAGNETISM 1 Magnets Complete the following: 1. Magnetic fields affect _ moving charges _____ and moving charges produce __ magnetic fields _______ . 2. The ends of a bar magnet are called __ poles ________. And are identified as the _ north pole ___ and the ____ south pole __ . 3. Like poles _ repel ______ and unlike poles __ attract ______ . Compare and contrast soft and hard magnetic materials . Soft materials are easily magnetized but also easily lose their magnetism. Hard materials are harder to magnetize but hold their magnetism longer. What symbol is used to designate a magnetic field? ______ _______________ B arrowrightnosp Draw a sketch of a bar magnet. 2 EARTH’S MAGNETIC FIELD If you were sent on a job to Earth’s magnetic south pole, where would you go geographically? Near the north geographic pole. Define: magnetic dip angle: The angle between the magnetic field and horizontal
-3- magnetic declination: The angle between the magnetic field direction to north and true north the direction to the geographic north pole 3 MAGNETIC FIELDS What are the SI units of the magnetic field? Tesla What are the cgs units of the magnetic field and the conversion factor between cgs and SI units? Gauss, 1G = 10 -4 T Under what condition will th force on a moving charge in a magnetic field be maximum? The force is maximum when the velocity is perpendicular to the field. Under what two different conditions can a charged particle be in a magnetic field and not experience any force? When it is stationary or moving parallel to field lines. What is the name of the rule used to determine the direction of the force on a moving charge in a magnetic field? The right hand rule. 4 MAGNETIC FORCE ON A CURRENT-CARRYING CONDUCTOR Write the equation for the force on a length of current-carrying wire listing and naming all variables along with their SI units. sin F BIL θ = F Force on wire N B magnetic field T I Current in wire A L Length of wire m θ angle between I and B deg A current is directed to the east inside an apparatus in which there is an upward magnetic field. In what direction is the current displaced?

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-4- toward the south 5 TORQUE ON A CURRENT LOOP AND ELECTRIC MOTORS Does the torque on a current loop depend on the shape of the loop? No, on area, current and number of turns of wire. How should a current loop be positioned so it has no torque on it in a magnetic field? The axis of the loop should be aligned with the magnetic field. Define the magnetic moment of a coil. What symbol is used and what are the SI units? Am 2 ˆ o m N IAn μ = arrowrightnosp Describe the following parts of a DC motor: commutator: rotates with motor, provides electric contact with coil and allows for changing direction of current flow brushes: make electrical contact with moving commutator 6 MOTION OF A CHARGED PARTICLE IN A MAGNETIC FIELD When a charged particle is made to move in a direction perpendicular to a magnetic field what path will it follow?
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MAGNETISM ANSWERS - PHYSICS 212 CHAPTER 19 MAGNETISM...

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