Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare? a. Both wires have the same resistivity; the longer wire has 3 times the resistance of the shorter wire. b. The shorter wire has 3 times the resistivity of the longer wire; both wires have the same resistance. c. The longer wire has 3 times the resistivity of the shorter wire; the longer wire has 3 times the resistance of the shorter wire. d. The longer wire has 3 times the resistivity of the shorter wire; both wires have the same resistance. e. Both wires have the same resistivity; the shorter wire has 3 times times the resistivity of the longer wire.

What is the speed of an object at a given moment?

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0