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Two parallel wires 1 m apart carry currents I1 = 2 A and I2 = 3 A in the SAME direction. Force per unit length:
ARepulsive 1.2 × 10⁻⁶ N/m
BAttractive 1.2 × 10⁻⁶ N/m
CZero
DAttractive 6 × 10⁻⁶ N/m
Answer & Solution
Correct answer: B. Attractive 1.2 × 10⁻⁶ N/m
F/L = μ₀ I1 I2 / (2πr). For currents in same direction: attractive (wires pulled together). Magnitude: (4π × 10⁻⁷ × 2 × 3) / (2π × 1) = 12 × 10⁻⁷ = 1.2 × 10⁻⁶ N/m.
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