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JEE Main2015PhysicsMagnetic Effects of CurrentActual

Two long straight parallel wires, carrying (adjustable) currents I 1 and I 2 , are kept at a distance d apart. If the force F between the two wires is taken as 'positive' when the wires repel each other and 'negative' when the wires attract each other, the graph showing the dependence of F , on the product I 1 I 2 , would be:

Correct answer

3

Step-by-step solution

Force between two parallel current carrying wires is given as f = μ 0 I 1 I 2 2 π d l F ∝ I 1 I 2 When I 1 ,   I 2 are in same direction the I 1 I 2  is + v e ⇒ attraction ⇒ -ve When I 1 I 2 are in opposite direction then I 1 I 2 = - v e ∴ Force = repulsive = +ve

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