2 Determine the initial direction of the deflection of charged particles
3 as they enter magnetic fields as shown in Figure P22.1.
8 numeric Dx, Dy, ddx, dx, dy, nx, ny;
21 p := draw_Bfletch((dx*(i-.5),dy*(j-.5)));
24 draw origin--(Dx,0)--(Dx,Dy)--(0,Dy)--cycle dashed evenly;
25 p := draw_velocity((-2ddx,Dy/2),(-ddx,Dy/2),2ddx);
26 draw_pcharge((-ddx,Dy/2), 6pt);
34 p := draw_Bfield((dx*(i-.5),0), (dx*(i-.5),.5dy), (ny-1)*dy);
36 draw origin--(Dx,0)--(Dx,Dy)--(0,Dy)--cycle dashed evenly;
37 p := draw_velocity((Dx+2ddx,Dy/2),(Dx+ddx,Dy/2),2ddx);
38 draw_ncharge((Dx+ddx,Dy/2), 6pt);
46 p := draw_Bfield((0,dy*(j-.5)), (.5dx,dy*(j-.5)), (nx-1)*dx);
48 draw origin--(Dx,0)--(Dx,Dy)--(0,Dy)--cycle dashed evenly;
49 p := draw_velocity((Dx+2ddx,Dy/2),(Dx+ddx,Dy/2),2ddx);
50 draw_pcharge((Dx+ddx,Dy/2), 6pt);
58 p := draw_Bfield((dx/2,dy*(j-.5))-dir(45), (dx/2,dy*(j-.5)), (ny-j)*sqrt(2)*dy);
61 p := draw_Bfield((dx*(i-.5),dy/2)-dir(45), (dx*(i-.5),dy/2), (nx-i)*sqrt(2)*dx);
63 draw origin--(Dx,0)--(Dx,Dy)--(0,Dy)--cycle dashed evenly;
64 draw (Dx/2,-ddx)--(Dx/2,Dy) dashed withdots scaled .3;
65 label.urt(btex $45^\circ$ etex, draw_langle((Dx/2,Dy),(Dx/2,Dy/2),(Dx,Dy), dx/2));
66 p := draw_velocity((Dx/2,-2ddx),(Dx/2,-ddx),2ddx);
67 draw_pcharge((Dx/2,0-ddx), 6pt);
74 Using our right hand rule for the cross product, and
75 $\vect{F}_B = q \vect{v} \times \vect{B}$
81 Force is out of the page.
87 Force is into the page.