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A small 12.6 g plastic ball is tied to a very light 28.4 cm string that is attached to the vertical wall of a room.

A small 12.6 g plastic ball is tied to a very light 28.4 cm string that is attached to the vertical wall of a room. (See the figure (Figure 1).) A uniform horizontal electric field exists in this room. When the ball has been given an excess charge of -1.10μC , you observe that it remains suspended, with the string making an angle of 17.4° with the wall.

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 Part A

 Find the magnitude of the electric field in the room.


 Part B

 Find the direction of the electric field in the room.

  to the right

  to the left


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