The wires which connect the battery of an automobile to its starting motor carry 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?

Calculate the force per unit length between two parallel long straight wires 2 cm apart in air, each carrying a current of 4 ampere.

Two long parallel wires are at a distance of 1 m. Both of them carry 1A of current. The force of attraction per unit length between the two wires is

Two long parallel wires are carrying currents of 5 A and 12 A respectively. If the force per unit length between these wires is 3 xx 10^-5 N m^-1 , the distance between them should be

Two long parallel wires are 0.4 m apart in air and carry currents of 5 A and 12 A respectively. Calculate the force on each metre of the wire, fi the currents are in the same direction .

Two long straight wires carrying the same current 1 and separated by a distance r exert fore F per unit length on each other. If the current is increased to 2 I and separation is reduced r/2, then force will become

Calculate the force per unit length on a long straight wire caerrying current of 4 A due to a parallel wire carrying 6 A current. Distance between the wires = 3 cm.

A current of 10 A flow around a closed path in a circuit which is in the horizontal plane as shown in the figure. The circuit consists of eight alternative arcs of radii r_(1)=0.08m and r_(2)=0.12m . Each subtends the same angle at the centre. An infinitely long straight wire carrying a current of 10 A is passing throgh the entre of the above circuit vertically with the direction of the current being into the plane of the circuit. What is the force acting on the wire at the centre due to the current in the circuit? What is the force acting on the arc AC and the straight segment CD due to the current at the centre?

Two parallel wires in free spaces are 10cm apart and each carries a current of 10A in the same direction. The force one wire exerts on the other per metre of length is