A point charge with a mass of 2.43 kg is placed on a string. A infinite sheet with a surface charge density of 8.

A point charge with a mass of 2.43 kg is placed on a string. A infinite sheet with a surface charge density of 8.2 micro-coulombs/m2 is orientated vertically to the left of the charge and the another infinite sheet with a surface charge density of -3.3 micro-coulombs/m2 is orientated horizontally beneath the charge.  Including the weight force, the charge swings to an angle of 18 degrees to the right (+x direction) with the vertical before coming to equilibrium. What is the charge on the string in micro-coulombs? If the charge is negative, make sure to include a negative sign.