Two long and parallel straight wires \(A\) and \(B\) carrying currents of \(8.0~\text{A}\) and \(5.0~\text{A}\) in the same direction are separated by a distance of \(4.0~\text{cm}.\) The force on a \(10\) cm section of wire A is:

The wires that connect the battery of an automobile to its starting motor carry a current of \(300~\text{A}\) (for a short time). What is the force per unit length between the wires if they are \(70~\text{cm}\) long and \(1.5~\text{cm}\) apart?
1. \(2.2~\text{N/m}\)
2. \(4.7~\text{N/m}\)
3. \(3.2~\text{N/m}\)
4. \(1.2~\text{N/m}\)