Two long parallel conductors separated by a distance d carry currents I₁ and I₂ in the same direction, and exert an attractive force F on each other. Now the current in one conductor is doubled and its direction reversed, while the separation is increased to 3d. What is the new force between them (taking the original attractive force as positive)?

PhysicsMediumHigh School (11–12)jee-main

The force per unit length between two long parallel wires is $F = \dfrac{\mu_0 I_1 I_2 L}{2\pi d}$ . Currents in the same direction attract; currents in opposite directions repel.

Two long parallel conductors separated by a distance $d$ carry currents $I_1$ and $I_2$ in the same direction, and exert an attractive force $F$ on each other. Now the current in one conductor is doubled and its direction reversed, while the separation is increased to $3d$ . What is the new force between them (taking the original attractive force as positive)?

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← An electron, a proton, and an alpha particle, all having the same kinetic energy, move in circular orbits of radii re, rp, r_α respectively in a uniform magnetic field B. Which relation holds among the radii?Two long parallel wires A and B carry currents I₁ and I₂ (with I₂ < I₁) in the same direction. At a point midway between the wires, the magnetic field magnitude is 10 µ T. If the current I₂ is reversed in direction (keeping both magnitudes fixed), the field at that point becomes 30 µ T. What is the ratio I₁/I₂? →

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