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Name: ______________________________ Williams Date: _____/_____/_____ Block: _____ PHYSICS Refer to pages 556 – 573 of your textbook. As you read, fill in the blanks with a word or phrase that best fits. Chapter 24: Magnetic Fields I. General Properties of Magnets A. Magnetic Poles 1) Magnets are ____________________ with two ends. One end is called the _____-pole and the other end is called the _____-pole. 2) Two alike poles will __________ each other while two unlike poles will __________ each other. B. How Do Magnets Affect Other Materials 1) Magnets can __________ many other __________ materials that are not magnetic. 2) These materials become ____________________ magnetized when in contact with a magnet. 3) The magnetism ____________________ when the object is pulled away from the magnet. C. Permanent Magnets 1) Many magnets are made up of an iron alloy called ____________________, which is made up of _____% aluminum, _____5 nickel, and _____% cobalt. 2) Rare earth elements like ____________________ and ____________________ can produce permanent magnets that are extremely strong for their size. II. Magnetic Fields Around Permanent Magnets A. Magnetic fields are similar to both ____________________ and ____________________ fields. B. Magnetic Field Lines 1) Imaginary lines that can provide a measure of _______________. a) The number of field lines passing through a surface is called the _________________________. b) The flux per unit area is ____________________ to the magnetic field strength. 2) Outside of a magnet the field lines come out of the __________ pole and enter the __________ pole. 3) Inside the magnet, field lines flow from __________ to __________ forming closed loops. III. Electromagnetism A. Magnetic Field Near a Current-Carrying Wire 1) The force of the magnetic field is ____________________ to the direction of the current in a wire. 2) The strength of the field is ____________________ to the current and varies ___________________ with the distance from the wire. 3) When using the first right-hand rule, your __________ points in the direction of the current and your _______________ point in the direction of the magnetic field. 1 Name: ______________________________ Williams Date: _____/_____/_____ Block: _____ PHYSICS B. Magnetic Fields Near a Coil 1) A _______________ is a long coil of wire consisting of many loops. 2) A solenoid becomes an ____________________ when a current is passed through the coil. 3) The strength of the field of an electromagnet is proportional to both the _______________ in the coil and the number of __________ in the coil. 4) When using the second right-hand rule, your _______________ point in the direction of the current and your __________ points toward the North Pole of the electromagnet. IV. Magnetic Domains A. Each _______________ in an atom acts like a tiny electromagnet. B. A domain can consist of __________ individual atoms. C. A domain’s size is still relatively small, ranging from _____ to __________ microns. V. Forces on Currents in Magnetic Fields A. ______________________________ discovered that the force on a wire is perpendicular to both the ______________________________ and the direction of the _______________. B. When using the third right-hand rule, your _______________ points in the direction of the magnetic field, your __________ points in the direction of the current, and your __________ faces the direction of the force. C. Force on a Wire Resulting From A Magnetic Field 1) The magnitude of the force is represented by the following equation: 2) F is __________ measured in N (newtons), B is ___________________________________ measured in T (teslas), I is _______________ measured in A (amperes), and L is the __________ of the wire measured in m (meters). VI. Galvanometers A. A galvanometer is a device used to ______________________________________________________. B. An electric motor converts _______________ energy to ____________________ energy. VII. The Force on a Single Charge Particle A. The force produced by a magnetic field on a single electron depends on the electron’s _____________. B. The magnitude of the force is represented by the following equation: C. F is __________ measured in N (newtons), B is ___________________________________ measured in T (teslas), q is _______________ in C (coulombs), and v is the _______________ measured in m/s (meters per second). 2