Figure E$27\mathrm{.}45$shows a portion of a silver ribbon with

z$1=11\mathrm{.}8$mm and y$1=0\mathrm{.}23$mm$,$carrying a current of $120$A in the

$+$x$-$direction. The ribbon lies in a uniform magnetic field, in the y

direction, with magnitude $0\mathrm{.}95$T$.$Apply the simplified model of the

Hall effect presented in Section $27\mathrm{.}9.$If there are $5\mathrm{.}85*10^28$free elec

trons per cubic meter, find $($a$)$the magnitude of the drift velocity of the

electrons in the x$-$direction; $($b$)$the magnitude and direction of the elec

tric field in the z$-$direction due to the Hall effect; $($c$)$the Hall emf.