Author Question: If the current density in a wire or radius R is given by J = kr, 0 < r < R, what is the ... (Read 35 times)

nmorano1 · **on:** Jul 29, 2018

If the current density in a wire or radius R is given by J = kr, 0 < r < R, what is the current in the wire?

A) 2kR3/3
B) 3kR3/2
C) kR3/3
D) kR2
E) kR2/2

Question 2

The main reason for the large inefficiency of the automobile is

A) the kinetic principle.
B) friction in the moving parts.
C) the first law of thermodynamics.
D) the second law of thermodynamics.
E) unburned hydrocarbons.