Question

помогите!!!!!!!!!!!!!!!!!!

Answer 1

$j= frac{I}{S}; I=U/R; R= frac{rho *l}{S} to I= frac{U*S}{rho *l}; j=frac{U*S}{rho *l*S}=frac{U}{rho *l} \ j= frac{24}{0.5*10}=4.8 (A)$