Magnetic Force Between Parallel Wires
Two parallel wires, separated by a distance d, carry currents I₁ and I₂ in the same direction. The resulting magnetic force per unit length between the wires is F/L. If the direction of current I₂ is reversed, what is the new magnetic force per unit length between the wires?
A
-2F/L
B
F/L
C
2F/L
D
-F/L
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