Задача id12406

A ball of mass m=1 kg and charge q=2•10-4 C is suspended on an insulating thread in a uniform electric field E=3•104 V/m, with vector E perpendicular to gravity and directed to the left. The ball was moved to the right so that the thread deviated at an angle a = 30° from the vertical. Find the tension force of the thread when it passes through a vertical position, g=10 m/s2.

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