Abox is to be made where the material for the sides and the lid cost $0.20 per square foot and the cost for the bottom is $0.350.35 per square foot. find the dimensions of a box with volume 3030 cubic feet that has minimum cost.

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?