"Michiel van der Vlist" bravely wrote to "DAVID
WILLIAMS" (06 Jun 05  09:43:01)
 --- on the heady topic of "Pnu 732"

 MvdV> Hello David,

 >
 > The electrons are travelling in a closed path - part of which
 MvdV> [..]
 > Also, of course, electrons that are travelling around curved
 > parts of the circuit must experience a centripetal force. Overall, the
 > net force on the electrons is zero, so there is no tendency for the
 > vacuum tube to accelerate through space.

 MvdV> If it did that would be a violation of the law of conservation of
 MvdV> momentum.


Michiel,

The electron gains momentum when it leaves the cathode and returns it
when it arrives at the plate. The two direction arrows cancel so
momentum is conserved.

 M*i*k*e

... Galileo: Condemned in 1633. Pardoned 359 years later. About time!!
--- Blue Wave/DOS v2.30