The most important advantage of AC (alternating current) over DC (direct current) is that

a. it is relatively straightforward to change the voltage delivered by an AC source.
b. AC is safer.
c. DC could only be used in the early days of electrical power distribution.
d. electric power cannot be delivered by a DC source.
e. DC results in more power loss in wire than AC.

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?