Which of the following statements is false?
a. diverging lenses always produce images that are upright.
b. converging lenses may be used as magnifying glasses
c. convex lenses always produce images that are inverted.
d. concave lenses always produce virtual images.

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?