Example Question #2 : Electromagnetics
A single string of wire has a resistance of . If the wire is connected to a power source, what is the strength of the magnetic field away from the wire?
So this is all about the magnetic field strength around a current carrying wire.
The equation for this is:
But you must use Ohm's Law in order to find the current in the wire.
Since the wire has of resistance and the voltage through the wire is , that means the current in the wire is .
Being sure to change into , plug everything in and get the answer, which is