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Apple's MagSafe tech—which allows you to snap an iPhone 12 or later to a slew of accessories, like chargers, holders, and desk setups—has been a great addition on the last few models of iPhone ...
MagSafe is a series of proprietary magnetically attached power connectors developed by Apple Inc. for Mac laptops. MagSafe was introduced on 10 January 2006, in conjunction with the MacBook Pro, the first Intel-based Mac laptop, at the Macworld Expo.
Devices without MagSafe or Qi2's Magnetic Power Profile (MPP) need to be manually aligned as they do not have the built-in array of magnets that interlock with MagSafe. [15] [16] Apple recommends a 20 W power adapter. [17] Users have reported MagSafe Chargers leaving circular imprints on leather cases. [18]
A switchable magnetic device usually consists of a magnetic circuit with permanent magnets. By moving some parts of this circuit, the magnetic flux can be directed within the device (off position) or externally (on position). [3] One type of magnetic switchable device is made from two blocks of iron, with a round cavity bored through the center.
The stronger magnetic fields can be hazardous to mechanical and electronic devices, as they can erase magnetic media such as floppy disks and credit cards, and magnetize watches and the shadow masks of CRT-type monitors at a greater distance than other types of magnet. In some cases, chipped magnets can act as a fire hazard as they come ...
Magnetic induction B (also known as magnetic flux density) has the SI unit tesla [T or Wb/m 2]. [1] One tesla is equal to 10 4 gauss. Magnetic field drops off as the inverse cube of the distance ( 1 / distance 3 ) from a dipole source. Energy required to produce laboratory magnetic fields increases with the square of magnetic field. [2]
(A non-circuit example would be a magnet with a straight cylindrical core.) To determine the force between two electromagnets (or permanent magnets) in these cases, a special analogy called a magnetic-charge model can be used. In this model, it is assumed that the magnets have well-defined "poles" where the field lines emerge from the core, and ...
A magnetic lock has a metal plate surrounded by a coil of wire that can be magnetized. The number of coils determines the holding force which characterizes the lock: Micro Size: 275 lbf (1,220 N) holding force. Mini Size: 650 lbf (2,900 N) holding force; Midi Size: 800 lbf (3,600 N) holding force; Standard Size: 1,200 lbf (5,300 N) holding force.
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