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MAGNETISM

MAGNETISM - PHYSICS 212 MAGNETISM WORKBOOK STUDENTS FULL...

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-1- PHYSICS 212 MAGNETISM WORKBOOK _____________________________________________ STUDENT’S FULL NAME

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-2- PHYSICS 212 OUTLINE MAGNETISM 1 Magnets Complete the following: 1. Magnetic fields affect ____________________ and moving charges produce ________________________ . 2. The ends of a bar magnet are called _______________. And are identified as the ______________ and the ________________ . 3. Like poles ____________ and unlike poles _______________ . Compare and contrast soft and hard magnetic materials . What symbol is used to designate a magnetic field? _____________________ 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? Define: magnetic dip angle: magnetic declination:
-3- 3 MAGNETIC FIELDS What are the SI units of the magnetic field? What are the cgs units of the magnetic field and the conversion factor between cgs and SI units? Under what condition will th force on a moving charge in a magnetic field be maximum? Under what two different conditions can a charged particle be in a magnetic field and not experience any force? What is the name of the rule used to determine the direction of the force on a moving charge in a magnetic field? 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. 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? 5 TORQUE ON A CURRENT LOOP AND ELECTRIC MOTORS Does the torque on a current loop depend on the shape of the loop?

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-4- How should a current loop be positioned so it has no torque on it in a magnetic field? Define the magnetic moment of a coil. What symbol is used and what are the SI units? Describe the following parts of a DC motor: commutator: brushes: 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? Describe the motion of a charged particle that has velocity components both perpendicular and parallel to a magnetic field? 7 MAGNETIC FIELD OF A LONG, STRAIGHT WIRE AND AMPÈRE’S LAW What is the permeability of free space, its symbol, numeric value, and SI units? How does the magnetic field strength of the field produced by a long, current carrying wire vary with distance from the wire? State Ampère’s Law.
-5- 8 MAGNETIC FORCE BETWEEN TWO PARALLEL CONDUCTORS How would you characterize the force between to parallel wires carrying current in the same direction? Define the SI units Ampere and Coulomb. 9 MAGNETIC FIELDS OF CURRENT LOOPS AND SOLENOIDS Sketch the magnetic field of a current loop. Show the direction of the current in the wire. Sketch the magnetic field os a solenoid . Show the direction of the current in the wire. 10 MAGNETIC DOMAINS What causes magnetism in materials?

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