$21\mathrm{.}65*$CP A small $12\mathrm{.}3-$g plastic ball is tied to a very light $28\mathrm{.}6-cm$ string that is attached to the vertical wall of a room $($Fig$.$ P$21\mathrm{.}65).$ A uniform horizontal electric field exists in this room. When the ball has been given an excess charge of $-1\mathrm{.}11C,$ you observe that it remains suspended, with the string making an angle of $17\mathrm{.}4$ with the wall. Find the magnitude and direction of the electric field in the room.