A horizontal parallel-plate capacitor with plate separation is connected to a battery…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A horizontal parallel-plate capacitor with plate separation 2.0 mm2.0\,\text{mm} is connected to a 150 V150\,\text{V} battery and remains connected. The plate area is 0.015 m20.015\,\text{m}^2. A tiny oil drop of mass 4.0×10−7 kg4.0\times10^{-7}\,\text{kg} carrying charge +2.0×10−9 C+2.0\times10^{-9}\,\text{C} is released from rest at the midpoint between the plates. Neglect air resistance and assume the electric force is the only force acting on the drop. How far does the drop move vertically during the first 1.0 ms1.0\,\text{ms} after its release? (a) 1.9 mm1.9\,\text{mm} (b) 0.019 mm0.019\,\text{mm} (c) 0.19 mm0.19\,\text{mm} (d) 0.38 mm0.38\,\text{mm}

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