APFIVE Magnetic Force Between Parallel Wires
Two parallel wires separated by distance d carry currents I₁ and I₂ in the same direction. If the magnetic force per unit length between them is F/L, what would be the new force per unit length if the current I₂ is reversed while keeping all other parameters constant?
A
-F/L
B
2F/L
C
-2F/L
D
F/L
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