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