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Download Chapter 17- Section 1 Magnets and Magnetic Fields
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Chapter 17- Section 1 Magnets and Magnetic Fields Magnets - Some materials can be made into ________________ magnets. o Although a magnetized piece of iron is called a “permanent” magnet, its magnetism can be _________________or even __________________. o _______________ is a soft magnetic material. It is ______________ magnetized. It tends to ____________its magnetic properties easily. o _______________ is a hard magnetic material. It is more _________________ to magnetize. Once _____________________, it doesn’t lose its magnetism easily. - Magnets exert ___________________________ on each other. - Like poles ______________, and opposite poles _____________________. o A ____________________ is one of two points, such as the ___________of a magnet, that have _________________ magnetic qualities. o Magnets have a _________ of poles, a ___________ pole and a ______________ pole. o It is impossible to isolate a ____________ magnetic pole from a __________ magnetic pole. Magnetic Fields - __________ are sources of magnetic fields. o Magnetic force is a ___________ force. o When magnets ________ or __________each other, it is due to the interaction of their _____. o A ______________ is a region where a magnetic force can be detected. Magnetic field lines are used to represent a _________________________. The magnetic field gets weaker with _______________ from the magnet. - - ___________ can track magnetic fields. o A compass is a __________ suspended on top of a pivot so that the magnet can rotate freely. o A compass aligns with _______ magnetic field. Earth’s magnetic field is like that of a ________ magnet. o Earth’s magnetic field has changed ____________throughout ____________ time. Earth’s magnetic poles are _______ the same as its ______________ poles. Chapter 17- section 2 Magnetism from Electric Currents Magnetism from Electric Currents - Hans Christian ______________ found that magnetism is produced by __________ electric charges. - Electric _________produce magnetic fields. - The magnetic field of a ______________________ resembles that of a bar magnet. - A _________________ is a coil of wire with an electric _______________ in it. o In a _______________, the magnetic field of each loop of wire adds to the _____________ of the magnetic field of the loop next to it. o More _______or more ________ can create a stronger magnetic field. - An electromagnet is a ______that has a soft _______ core and that acts as a ________ when an electric __________ is in the coil. - - Magnetism can be caused by _______________________. o Negatively charged __________ moving around the nuclei of all atoms make magnetic fields. o Atomic nuclei also have magnetic fields because _____________ move within the nucleus. o Each electron has a property called ____________, which also produces a tiny magnetic field. Magnetic atoms rotate to __________ with the magnetic fields of nearby atoms creating small regions within the material called ____________. Electromagnetic Devices - Galvanometers detect _______________. o A __________________ is an instrument that ___________, ____________, and determines the ________________ of small electric current. - Electric motors convert _____________ energy to ________________ energy. Chapter 17- section 3 Electric Currents from Magnetism Electromagnetic Induction and Faraday’s Law - ____________________________________ is the process of creating a current in a circuit by __________________ a magnetic field. - _______________ law states the following: _______________________________________________________________________. o As the __________ moves in and out of the magnetic field of the magnet, a current is _________ in the ______________. o ________________ the circuit or changing the _______________ of the magnetic field will also induce a ______________ in the circuit. - A _______________ is a machine that converts _____________ energy to ______________ energy. - An _________________ current is an electric current that changes ___________ at regular intervals. o For each half __________ of the loop in an AC ___________, the current produced by the generator ________________ direction. - __________________ produce the electrical energy you use in your home. Transformers - A ____________ is a device that increases or decreases the _____________ of alternating ________. o Transformers can ____________ or _____________ voltage. The voltage induced in the ________________ coil of a transformer depends on the ______________of loops, or turns, in the ____________. o In a ______________ transformer the voltage across the secondary coil is _____________ than the voltage across the primary coil. o In a _________________ transformer, the secondary coil has __________ loops than the primary coil and the voltage is ____________ by the transformer. That’s All Folks!!