# The wires which connected the battery of an automobile to its starting motor carrying a current of $300\;A$ (for a short time ). What is the force per unit length between the wires , if they are $70\;cm$long and $1.5 \;cm$ apart? Is the force attractive or repulsive ?
$\begin{array}{1 1} F=0.12 \;N/m,attractive \\ F=0.12N/m,repulsive \\ F= 1.12N/m,attractive \\ F=1.12N/m,repulsive \end{array}$