Two charged particles are fixed to an x-axis: particle 1 of charge q1= 2.1 x 10-8 c is at position x=20 cm and particle 2 of charge q2=−4.00 q1 is at position x = 70 cm. (a) at what coordinate on the x-axis (other than at infinity) is the net electric field produced by the two particles equal to zero?

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)