Two charges are placed on thexaxis. One of the charges (q₁= +5.12C) is atx₁= +3.00 cm and the other (q₂= -22.8C) is atx₂= +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at(a)x= 0 cm and(b)x= +6.00 cm.

a. = ? N/C

b = ? N/C

A particle of charge+17.8Cand mass4.12 10^-5kgis released from rest in a region where there is a constant electric field of+399N/C.What is the displacement of the particle after a time of3.21 10^-2s?

= m?