28. (a) Consider a segment of the projectile betweenyandy+dy. We use Eq. 30-14 to Fnd the magneticforce on the segment, and Eq. 30-9 for the magnetic Feld of each semi-inFnite wire (the top railreferred to as wire 1 and the bottom as wire 2). The current in rail 1 is in the+ˆi direction, andthe current in the rail 2 is in the−ˆi direction. The Feld (in the region between the wires) set upby wire 1 is into the paper (the−ˆk direction) and that set up by wire 2 is also into the paper. Theforce element (a function ofy) acting on the segment of the projectile (in which the current ﬂowsin the−ˆj direction) is given below. The coordinate origin is at the bottom of the projectile.d~F=d~
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.