A long wire A carries a current of 10 A. Another long wire B, which is parallel to A and separated by 0.1 m from A, carries a current of 5 A, in the opposite direction to that in A. What is the magnitude and nature of the force experienced per unit length of B?
$({\mu }_0=4\mathrm{\pi }\times {10}^{-7}weber/amp-\mathrm{m})$
 

Two long parallel copper wires carry currents of 5 A each in opposite directions. If the wires are separated by a distance of 0.5 m, then the force between the two wires will be:

What will happen if two thin, long parallel wires separated by a distance "d" carry current "i" in the same direction?

A rectangular loop carrying a current \(\mathrm{I_1}\), is situated near a long straight wire carrying a steady current \(\mathrm{I_2}\). If the wire is parallel to one of the sides of the loop and is in the plane of the loop as shown in the figure, then the current loop will:
         

As indicated, a long, straight conductor XY carrying a current i₁ is placed antiparallel to a conductor AB of length l carrying a current i₂. How much of a force is acting on AB?

1. ${\mu }_0{i}_1{i}_2$

2.  $\frac{{\mu }_0{i}_1{i}_2}{\mathrm{\pi }}$

3. $\frac{{\mu }_0{i}_1{i}_2}{2\mathrm{\pi }}$

4. $2{\mu }_0{i}_1{i}_2$

An arrangement of three parallel straight wires placed perpendicular to the plane of paper carrying the same current in the same direction is shown in the figure. The magnitude of force per unit length on the middle wire \(B\) is given by:
    

Three long, straight, and parallel wires carrying currents of 30 A, 10 A, and 20 A in P, Q, and R, respectively, are arranged as shown in the figure. What is the force experienced by a 10 cm length of wire Q?