A coil without a ferromagnetic core is called an air-core coil.

Both versions contain a 9 metre cable stub that is either air-core or gel-filled.

So it functioned as an air-core RF transformer with variable coupling.

Air-core motors, as described below.

They were air-core transformers and consisted merely of concentric primary and secondary coils.

It is desirable that the reactor does not go into magnetic saturation during a short-circuit, so generally an air-core coil is used.

Seeing a video of dolphins blowing air-core vortex rings convinced Irvine of the feasibility of the feat.

The air which comprises the magnetic circuit is essentially lossless, and so an air-core transformer eliminates loss due to hysteresis in the core material.

By passing these currents through his newly invented air-core transformers, he could increase their voltage ten-thousand fold and reduce the amperage proportionately.

Installation of air-core coils requires consideration of the magnetic field produced by the coils, which may induce current in large nearby metal objects.

As with proximity card technology, near-field communication uses magnetic induction between two loop antennas located within each other's near field, effectively forming an air-core transformer.

In the 1920s he originated techniques for creating ultrastrong magnetic fields by injecting high current for brief periods into specially constructed air-core electromagnets.

This includes air-core inductors and air-core transformers.

In addition benchtop meters allow the usage of special fixtures to measure SMD components, air-core coils or transformers.

The Tesla coil (L1, L2), an air-core double-tuned resonant transformer, which generates the high output voltage.

A Tesla coil is a radio frequency oscillator that drives an air-core double-tuned resonant transformer to produce high voltages at low currents.

Oudin and Tesla coils are spark-excited air-core double-tuned transformer circuits that use resonance to generate very high voltages at low currents.

Diamond Rose has now received final results from heavy mineral analysis of 75 scout air-core drill samples from geophysical targets at Upper Beta Creek.

Air-core smoothing coils resemble, but are considerably larger than, carrier frequency choke coils in high voltage transmission lines and are supported by insulators.

The outer toroidal magnetic field is produced by eight very large air-core superconducting barrel loops and two end-caps, all situated outside the calorimeters and within the muon system.

A physical core is not an absolute requisite and a functioning transformer can be produced simply by placing the windings near each other, an arrangement termed an 'air-core' transformer.

The secondary LC circuit is composed of a tightly coupled air-core transformer secondary coil driving the bottom of a separate third coil helical resonator.

Therefore, the most powerful man-made magnetic fields have been generated by air-core nonsuperconducting electromagnets of a design invented by Francis Bitter in 1933, called Bitter electromagnets.

A minimum programme of 4000 metres of air-core drilling is planned to be completed by the end of November, principally to follow up and test gold anomalies discovered in earlier reconnaissance drilling.

Ferrite "flux confinement" cores can confine the magnetic fields, improving coupling and reducing interference to nearby electronics, but they are heavy and bulky so small wireless devices often use air-core coils.