A) straight line
B) parabola
C) ellipse
D) rectangular hyperbola
Correct Answer: A
Solution :
The force per unit length between two parallel wires carrying currents ii and 12 separated by a distance R is given by \[\frac{F}{l}=\frac{{{\mu }_{0}}}{2\pi }\,\frac{{{i}_{1}}{{i}_{2}}}{2}\] \[\Rightarrow \] \[\frac{F}{l}\alpha \frac{1}{R}\] Hence, graph between force per unit length and distance between wires is a straight line.
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