Examples of solenoid in the following topics:
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- Solenoids are loops of wire around a metallic core, and can be used to create controlled magnetic fields.
- A solenoid is a coil wound into a tightly packed helix.
- In physics, the term solenoid refers to a long, thin loop of wire, often wrapped around a metallic core; it produces a magnetic field when an electric current is passed through it.
- Solenoids are important because they can create controlled magnetic fields and can be used as electromagnets.
- The term solenoid refers specifically to a coil designed to produce a uniform magnetic field in a volume of space (in which some experiment might be performed).
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- Let's consider Fig 1 , an example of a solenoid (ℓ: length, N: number of turns, I: current, A: cross-section area) that works as an inductor.
- From Eq. 1, the energy stored in the magnetic field created by the solenoid is:
- Magnetic field created by a solenoid (cross-sectional view) described using field lines.
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- Magnetic field created by a solenoid (cross-sectional view) described using field lines.
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- One exception is the solenoid, because it has a very uniform field inside, a nearly zero field outside, and a simple shape.
- The self-inductance of a solenoid of cross-sectional area A and length ℓ is
- Note that the inductance depends only on the physical characteristics of the solenoid, consistent with its definition.
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- In eukaryotes, DNA supercoiling exists on many levels of both plectonemic and solenoidal supercoils, with the solenoidal supercoiling proving the most effective in compacting the DNA.
- Solenoidal supercoiling is achieved with histones to form a 10 nm fiber.
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- The coil forming the shape of a straight tube (a helix) is called a solenoid, as shown in .
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- It is the fundamental operating principle of transformers, inductors, and many types of electrical motors, generators, and solenoids.
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- It may be a hydraulic controller positioned by a solenoid or electric motor in response to an electronic error signal, an employee directed to rework the parts that failed to pass quality inspection, or a school principal who decides to buy additional books to provide for an increased number of students.
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- Ampere's law is always valid for steady currents and can be used to calculate the B-field for certain highly symmetric situations such as an infinite wire or an infinite solenoid.