Magnetism: An Invisible Force

Magnetism: An Invisible Force
Magnetism: An Invisible Force
Magnetism is a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects. Earth itself is a giant magnet with its magnetic field guiding compasses.
Magnetic Field Lines
Magnetic Field Lines
Magnetic fields can be visually represented by lines emanating from north to south poles. These invisible lines illustrate the force's direction and strength; closer lines indicate stronger magnetic forces.
Electromagnets: Controllable Magnets
Electromagnets: Controllable Magnets
Electromagnets are made from coils of wire around a metallic core. When electric current flows through the coil, a magnetic field is created, which can be turned on and off, unlike permanent magnets.
Magnetic Materials
Magnetic Materials
Not all materials are magnetic. Ferromagnetic materials like iron, cobalt, and nickel can be magnetized. Other materials, diamagnetic or paramagnetic, interact with magnets differently, with much weaker effects.
Earth's Magnetic Reversals
Earth's Magnetic Reversals
Earth's magnetic poles have reversed many times over the planet's history. During a reversal, the magnetic field weakens, compasses would flip directions, and it could affect animal migrations.
Magnetic Levitation
Magnetic Levitation
Magnetic levitation, or maglev, uses magnets to lift objects, reducing friction. This technology is used in advanced train systems to enable high-speed, low-maintenance travel.
Wireless Power Transfer
Wireless Power Transfer
Magnets are crucial in wireless power transfer technologies, enabling charging without direct contact. This is utilized in electric toothbrushes, smartphones, and is being developed for electric vehicles.
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What produces magnetism?
Gravitational force interaction
Electric charge in motion
Chemical reactions