Two long parallel current carrying wires carry currents i1= 2.0 A and i2= 3.5 A and are separated by a distance d= 15.0 cm as shown in the diagram. At what location y would a third parallel wire carrying a current i = 5.0 A need to be placed so that it feels zero net magnetic force?

Adielectric-filled parallel-plate capacitor has plate area a = 30.0 cm2 , plate separation d = 9.00 mm and dielectric constant k = 3.00. the capacitor is connected to a battery that creates a constant voltage v = 15.0 v . throughout the problem, use ϵ0 = 8.85x10-12 c2/n.m2 . find the energy u1 of the dielectric-filled capacitor.