Two long and parallel wires are at a distance of 0.1 m and a current of 5 A is flowing in each of these wires. The force per unit length due to these wires will be [CPMT 1977]

• A.            \[5\times {{10}^{-5}}\,N/m\]
• B.            \[5\times {{10}^{-3}}\,N/m\]
• C.            \[2.5\times {{10}^{-5}}\,N/m\]                                        
• D.            \[2.5\times {{10}^{-4}}\,N/m\]