Answer:
(C) [tex]0.02 N[/tex] , The wires repel
Explanation:
We are given that
Length of wire=L=7 m
[tex]I_1=I_2=I=7 A[/tex]
[tex]r=4 mm=4\times 10^{-3} m[/tex]
[tex]1 mm=10^{-3} m[/tex]
We have to find the magnitude and direction of the force that the two segments of this cord exert on each other.
[tex]F=\frac{2\mu_0I_1I_2L}{4\pi r}[/tex]
Where [tex]\frac{\mu_0}{4\pi}=10^{-7}[/tex]
Using the formula
[tex]F=\frac{2\times 10^{-7}\times 7\times 7\times 7}{(4\times 10^{-3}}[/tex]
[tex]F=0.017 N\approx 0.02 N[/tex]
When the wires carrying current in equal current in opposite direction then, the wire repel to each other.
Hence, the wires repel to each other.
