$3\mathrm{.}4$ Consider $1e$ electrode reactions for which $=0\mathrm{.}50$ and $=0\mathrm{.}10.$ Calculate the relative error in current resulting from the use in each case of:

$($a$)$ The linear $i-$ characteristic for overpotentials of $10,20,$ and $50mV.$

$($b$)$ The Tafel $($totally irreversible$)$ relationship for overpotentials of $50,100,$ and $200mV.$