It does not seem like a good article.on Wikipedia. When direct current <http://en.wikipedia.org/wiki/Direct_current> is pumped through the tether, it exerts a force against the magnetic field, and the tether accelerates the spacecraft.
Should read as When direct current <http://en.wikipedia.org/wiki/Direct_current> is pumped through the tether, it exerts a force against the magnetic field gradient, and the tether accelerates the spacecraft. The field is very weak and the gradient even weaker. *F*=[image: [del]](*m*· *B*) or *F*=(*m*·[image: [del]])*B* apparently there is some ambiguity on this subject: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=AJPIAS000056000008000688000001&idtype=cvips&gifs=yes David On 12/23/06, Frederick Sparber <[EMAIL PROTECTED]> wrote:
Would this work, Michel? :-) Fred http://en.wikipedia.org/wiki/Electrodynamic_tether
