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2. Solenoid - Wikipedia

   en.wikipedia.org/wiki/Solenoid

   A solenoid (/ ˈ s oʊ l ə n ɔɪ d / [1]) is a type of electromagnet formed by a helical coil of wire whose length is substantially greater than its diameter, [2] which generates a controlled magnetic field. The coil can produce a uniform magnetic field in a volume of space when an electric current is passed through it.

3. Solenoid (engineering) - Wikipedia

   en.wikipedia.org/wiki/Solenoid_(engineering)

   Hydraulic solenoid valves are in general similar to pneumatic solenoid valves except that they control the flow of hydraulic fluid (oil), often at around 3000 psi (210 bar, 21 MPa, 21 MN/m 2). Hydraulic machinery uses solenoids to control the flow of oil to rams or actuators. Solenoid-controlled valves are often used in irrigation systems ...

4. Aharonov–Bohm effect - Wikipedia

   en.wikipedia.org/wiki/Aharonov–Bohm_effect

   Aharonov–Bohm effect apparatus showing barrier, X; slots S 1 and S 2; electron paths e 1 and e 2; magnetic whisker, W; screen, P; interference pattern, I; magnetic flux density, B (pointing out of figure); and magnetic vector potential, A. B is essentially nil outside the whisker. In some experiments, the whisker is replaced by a solenoid.

5. Solenoid valve - Wikipedia

   en.wikipedia.org/wiki/Solenoid_valve

   where d is the orifice diameter. A typical solenoid force might be 15 N (3.4 lb f). An application might be a low pressure (e.g., 10 psi (69 kPa)) gas with a small orifice diameter (e.g., 3 ⁄ 8 in (9.5 mm) for an orifice area of 0.11 in 2 (71 mm 2) and approximate force of 1.1 lbf (4.9 N)).

6. Voice coil - Wikipedia

   en.wikipedia.org/wiki/Voice_coil

   Thus a 100 mm diameter voice coil, with a 12 mm winding height has similar power handling to a 50 mm diameter voice coil with a 24 mm winding height. In 'underhung' voice coil designs (see below), the coil is shorter than the magnetic gap, a topology that provides consistent electromotive force over a limited range of motion, known as X max.

7. Solenoidal vector field - Wikipedia

   en.wikipedia.org/wiki/Solenoidal_vector_field

   An example of a solenoidal vector field, (,) = (,) In vector calculus a solenoidal vector field (also known as an incompressible vector field, a divergence-free vector field, or a transverse vector field) is a vector field v with divergence zero at all points in the field: =