A ball of 80mg mass and a 2*10-8 charge is hung with a thread in a uniform horizontal electric field of 2*104V/m. What is the angle made by the thread with vertical?

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A ball of 80mg mass and a 2*10<sup>-8</sup> charge is hung with a thread in a uniform horizontal electric field of 2*10<sup>4</sup>V/m. What is the angle made by the thread with vertical?