Given three charges in a standard coordinate system. Calculate the magnitude and direction of the net electrostatic force on each. a) +10uc at (0m , 0m)
b) -20uC at (0m , +3m)
c) +25uC at (-4m , 0m)

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z