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 the conductors (taking attractive as positive)?

PhysicsMediumHigh School (11–12)jee-main

The force per unit length between two long parallel current-carrying wires is $F \propto \dfrac{I_1 I_2}{d}$ , and is attractive if the currents are parallel, repulsive if antiparallel.

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 the conductors (taking attractive as positive)?

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← A proton and an alpha particle enter a uniform magnetic field perpendicular to their velocity, both with the same speed. The proton completes 5 revolutions in 25 µ s. What is the periodic time for the alpha particle?Two long parallel straight wires carrying currents I₁ and I₂ (with I₂ < I₁) are placed a certain distance apart, both currents flowing in the same direction. The magnetic field at a point exactly midway between the wires is measured to be 10 µ T. When the current I₂ is reversed in direction (keeping its magnitude the same), the field at that midpoint becomes 30 µ T. What is the ratio I₁/I₂? →

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