In each of five situations, two point charges (Q₁, Q₂) are separated by a distance d. Rank them in order of the magnitude of the electric force on Q₁, from largest to smallest.

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(a) Q1 = 1 µC, Q2 = 2 µC, d = 1 m (b) Q1 = 2 µC, Q2 = -1 uC, d =1 m (c) Q1 = 2 µC, Q2 = -4 µC, d = 4 m (d) Q1 = -2 µC, Q2 = 2 µC, d = 2 m (e) Q1 = 4 µC, Q2 = -2 µC, d = 4 m