Asmall 13.0-g plastic ball is tied to a very light 27.2-cm string that is attached to the vertical wall of a room (fig. p21.65). a uniform horizontal electric field exists in this room. when the ball has been given an excess charge of -1.10 mc, you observe that it remains suspended, with the string making an angle of 17.4° with the wall. find the magnitude and direction of the electric field in the room.
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