A long, straight wire carries a current of 48 A. The magnetic field produced by this current at a certain point is 6.5 10-5 T. How far is the point from the wire?

Answer 1

Look up Ampere's law for the magnetic field around a straight wire.

You can find it at

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magcur.html

Solve for the unknown distance, r. Show your work if you need additional assistance.