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JEE Main 2004 Physics question

PhysicsMoving Charges and MagnetismJEE Main 2004

Two long conductors, separated by a distance d carry current and in the same direction. They exert a force on each other. Now the current in one of them increased to two times and its direction reversed. The distance is also increased to 3 d. The new value of the force between them is

Answer: (3)

Solution

per unit length (attractive for parallel currents). With and : \frac{μ_0I_1(-2I_2)}{2π(3d)}$ =

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Question ID VK-038341