Along wire carries a current density proportional to the distance from its center, j=(jo/ro)•r, where jo and ro are constants appropriate units. determine the magnetic field vector inside this wire.

Explanation:

As the current density is given as

now we have current inside wire given as

Now by Ampere's law we will have

statement #3 on andre"s list is false.

there are no contact forces mentioned on the list of choices that you've provided.