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    finding charge on the ball and tension on the string?

    A charged cork ball of mass 2.00 g is suspended on a light string in the presence of a uniform electric field, as shown in the figure below. When E = (1.60 + 5.00 ) 105 N/C, the ball is in equilibrium at ? = 37.0°. (a) Find the charge on the ball. (b) Find the tension in the string.
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