A spherical rain drop of radius 1.0 mm has a charge of +2.0 nC. The electric field in the vicinity is 2.0 kN/C downward. The terminal speed of an identical but uncharged drop is 6.5 m/s. The drag force is related to the drop’s speed by Fd = bv² (turbulent drag rather than viscous drag). Calculate the terminal speed of the charged rain drop.

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7.0 nC 8.0 cm | -4.0 µC -4.0 µC 2.0 cm 2.0 cm