Because of the above limitations of passive shielding, an alternative used with static or low-frequency fields is active shielding; using a field created by electromagnets <https://en.wikipedia.org/wiki/Electromagnet> to cancel out the ambient field within a volume.[7]<https://en.wikipedia.org/wiki/Electromagnetic_shielding#cite_note-7> Solenoids <https://en.wikipedia.org/wiki/Solenoid> and Helmholtz coils<https://en.wikipedia.org/wiki/Helmholtz_coil> are types of coils that can be used for this purpose.
We saw a solenoid around the reactor, didn't we? https://en.wikipedia.org/wiki/Electromagnetic_shielding 2013/7/26 DJ Cravens <[email protected]> > the magnetic field from a dipole falls of as the inverse cube of the > distance. .... it falls off quickly. I am not sure what it would be > outside a mu metal shielded device, but I would expect not much would be > available for "tools across the room". > > > ------------------------------ > Date: Fri, 26 Jul 2013 13:45:17 -0300 > Subject: Re: [Vo]:Defkalion/MFMP implications for electrolysis? > From: [email protected] > To: [email protected] > > > Also, this: > > https://en.wikipedia.org/wiki/Neodymium_magnet_toys > > > 2013/7/26 Daniel Rocha <[email protected]> > > It is a strong field. But it falls fast, specially if the magnetized > object is tiny: > > https://en.wikipedia.org/wiki/Neodymium_magnet > > 2013/7/26 Jones Beene <[email protected]> > > That kind of field at 20 cm from the device (their claim) would be > pulling tools from across the room. > > ** ** > Jones**** > > > > > -- > Daniel Rocha - RJ > [email protected] > > > > > -- > Daniel Rocha - RJ > [email protected] > -- Daniel Rocha - RJ [email protected]
