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This timeline lists significant discoveries in physics and the laws of nature, including experimental discoveries, theoretical proposals that were confirmed experimentally, and theories that have significantly influenced current thinking in modern physics. Such discoveries are often a multi-step, multi-person process.
If a magnet moves towards a closed loop, then the induced current in the loop creates a field that exerts a force opposing the motion of the magnet. Lenz's law can be derived from Faraday's law of induction by noting the negative sign on the right side of the equation.
1600: William Gilbert: Earth's magnetic field. 1608: Earliest record of an optical telescope. 1609: Johannes Kepler: first two laws of planetary motion. 1610: Galileo Galilei: Sidereus Nuncius: telescopic observations. 1614: John Napier: use of logarithms for calculation. [127] 1619: Johannes Kepler: third law of planetary motion.
This timeline includes developments in subfields of condensed matter physics such as theoretical crystallography, solid-state physics, soft matter physics, mesoscopic physics, material physics, low-temperature physics, microscopic theories of magnetism in matter and optical properties of matter and metamaterials.
The machine illustrated here uses eight disks and nine rows of magnets: 72 magnets in all. The rotors first used were wound as sixteen axial bobbins, one per pole. Compared to the bipolar dynamo, this did have the advantage of more poles giving a smoother output per rotation, [ note 2 ] which was an advantage when driving arc lamps.
1972 – Douglas Osheroff, Robert C. Richardson, and David M. Lee discover that helium-3 can become a superfluid [22] 1974 – Kenneth G. Wilson develops the renormalization group technique for treating phase transitions [23] 1980 – Klaus von Klitzing discovers the quantum Hall effect [24]
In the 19th century it had become clear that electricity and magnetism were related, and their theories were unified: wherever charges are in motion electric current results, and magnetism is due to electric current. [3] The source for electric field is electric charge, whereas that for magnetic field is electric current (charges in motion).
6th century - John Philoponus introduces the concept of impetus [3] and The theory was modified by Avicenna in the 11th century and Ibn Malka al-Baghdadi in the 12th century; 6th century - John Philoponus says that by observation, two balls of very different weights will fall at nearly the same speed. He therefore tests the equivalence principle
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