If the current density in a wire or radius R is given by J = kr, ...

[nmorano1]

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.

[lin77x]

Answer to Question 1

A

Answer to Question 2

D

[nmorano1]

Thanks for the timely response, appreciate it

[bitingbit]

Wow, this really help