Magnetic Fields and Magnetism

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What is a magnetic field?
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A region around a magnetic material or moving electric charge within which the force of magnetism acts.
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Define magnetic field lines.
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Imaginary lines that represent the direction and strength of a magnetic field, emanating from the north pole to the south pole of a magnet.
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What are magnetic poles?
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Regions at the ends of a magnet where the magnetic force is strongest; each magnet has a north and a south pole.
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State the laws of magnetism.
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Like poles repel each other; unlike poles attract each other.
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What is magnetism?
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A force of attraction or repulsion due to the motion of electric charges, resulting in magnetic fields.
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Explain the concept of magnetic domains.
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Small regions within a material where the magnetic moments are aligned with each other.
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Describe the Earth's magnetic field.
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A geomagnetic field resembling a giant bar magnet tilted with respect to the Earth's rotational axis.
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How does the magnetic field impact compass navigation?
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A compass needle aligns with Earth's magnetic field, indicating direction.
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What is the magnetic declination?
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The angle between geographic north and magnetic north, varying by location.
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How can magnetic fields be visualized?
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Using iron filings to form patterns that indicate field lines.
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What happens when magnetic poles are cut?
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Each piece becomes a smaller magnet with its own north and south poles.
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How do magnetic fields exert force on moving charges?
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Through the Lorentz force, which acts perpendicular to the velocity of the charge and the magnetic field.
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What is electromagnetic induction?
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The process of generating an electromotive force through a changing magnetic field.
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What is a solenoid?
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A coil of wire that generates a magnetic field when carrying an electric current.
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How are magnetic fields used in technology?
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In electric motors, generators, MRI machines, and data storage devices.
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