A positive charge of q_{t} = 1.0nC is fixed at x = 0.0 cm * y = 1.2 cm . A negative charge of q. = -1.3 nC is fixed at x = 1.8 cm , y = 0.0 cm . (Hint: nano means 10 ^ - 9 and centi means 10 ^ - 2 Make your signs correct throughout !) a) What are the x and y components of the electric field at the origin due to these two charges? b) What would be the x and y components of the force on a negative charge, q_{3} = - 3.0nc , if it were placed at the origin?