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Although it is possible to shield from magnetic fields by re-routing them through material with high magnetic permeability, all magnetic fields must terminate in an opposite charge. That's why there are no magnetic monopoles in existence. Once a magnetic field is created, it is not stopped by living tissue.

Electric fields, on the other hand, are easily shielded by almost anything, including living tissue. Living tissue with varying conductivity may act more or less like a Faraday Cage (http://en.wikipedia.org/wiki/Faraday_cage).

The lines of force of a magnetic field are not affected by the electrical conductivity of materials through which the magnetic field passes. This may be why the MEG signal is unimpeded by electrical conductances across living tissue.

Although it is possible to shield from magnetic fields by re-routing them through material with high magnetic permeability, all magnetic fields must terminate at the opposite pole. That's why there are no magnetic monopoles in existence. Once a magnetic field is created, it is not stopped by living tissue.

Electric fields, on the other hand, are easily shielded by almost anything, including living tissue. Living tissue with varying conductivity may act more or less like a Faraday Cage (http://en.wikipedia.org/wiki/Faraday_cage).

The lines of force of a magnetic field generally are less affected than electric fields by the electrical conductivity of materials through which the magnetic field passes. This may be why the MEG signal is unimpeded by electrical conductances across living tissue.

An electric field is a static field. It arises from a charge which is STATIONARY with respect to the observer. An electric field may be associated with a monopole. The lines of force of an electric field radially converge on the charge.

A magnetic field is generated by electric current. It arises from charged particles which carry a charge that is MOVING with respect to the observer. A magnetic field always is associated with a dipole, as it requires current to flow between opposite charges in order to generate the magnetic field.

There is no way to block a magnetic field. Although it is possible to shield from magnetic fields by re-routing them through material with high magnetic permeability, all magnetic fields must terminate in an opposite charge. That is why there are no magnetic monopoles in existence. Once a magnetic field is created by the flow of electric current, it is not stopped by any material.

Electric fields, on the other hand, are easily shielded by almost anything, including living tissue. Living tissue with varying conductivity may act more or less like a Faraday Cage (http://en.wikipedia.org/wiki/Faraday_cage).

The lines of force of a magnetic field are not affected by the electrical conductivity of materials through which the magnetic field passes. This may be why the MEG signal is unimpeded by electrical conductances across living tissue.

Although it is possible to shield from magnetic fields by re-routing them through material with high magnetic permeability, all magnetic fields must terminate in an opposite charge. That's why there are no magnetic monopoles in existence. Once a magnetic field is created, it is not stopped by living tissue.

Electric fields, on the other hand, are easily shielded by almost anything, including living tissue. Living tissue with varying conductivity may act more or less like a Faraday Cage (http://en.wikipedia.org/wiki/Faraday_cage).

The lines of force of a magnetic field are not affected by the electrical conductivity of materials through which the magnetic field passes. This may be why the MEG signal is unimpeded by electrical conductances across living tissue.

An electric field is a static field. It arises from a charge which is STATIONARY with respect to the observer. An electric field may be associated with a monopole. The lines of force of an electric field radially converge on the charge.

A magnetic field is generated by electric current. It arises from charged particles which carry a charge that is MOVING with respect to the observer. A magnetic field always is associated with a dipole, as it requires current to flow between opposite charges.

There is no way to block a magnetic field. Although it is possible to shield from magnetic fields by re-routing them through material with high magnetic permeability, all magnetic fields must terminate in an opposite charge. That is why there are no magnetic monopoles in existence. Once a magnetic field is created by the flow of electric current, it is not stopped by any material.

Electric fields, on the other hand, are easily shielded by almost anything, including living tissue. Living tissue with varying conductivity may act more or less like a Faraday Cage (http://en.wikipedia.org/wiki/Faraday_cage).

The lines of force of a magnetic field are not carried by conductive materials. This may be why the MEG signal is unimpeded by electrical conductances across living tissue.

An electric field is a static field. It arises from a charge which is STATIONARY with respect to the observer. An electric field may be associated with a monopole. The lines of force of an electric field radially converge on the charge.

A magnetic field is generated by electric current. It arises from charged particles which carry a charge that is MOVING with respect to the observer. A magnetic field always is associated with a dipole, as it requires current to flow between opposite charges in order to generate the magnetic field.

There is no way to block a magnetic field. Although it is possible to shield from magnetic fields by re-routing them through material with high magnetic permeability, all magnetic fields must terminate in an opposite charge. That is why there are no magnetic monopoles in existence. Once a magnetic field is created by the flow of electric current, it is not stopped by any material.

Electric fields, on the other hand, are easily shielded by almost anything, including living tissue. Living tissue with varying conductivity may act more or less like a Faraday Cage (http://en.wikipedia.org/wiki/Faraday_cage).

The lines of force of a magnetic field are not affected by the electrical conductivity of materials through which the magnetic field passes. This may be why the MEG signal is unimpeded by electrical conductances across living tissue.