Question

Which statement is true?

A) As the electric current through a wire increases, the magnetic field around the wire
becomes stronger.
B) As the electric current through a wire increases, the magnetic field around the wire becomes weaker.
C) As the electric current through a wire increases, the magnetic field around the wire is unaffected.
D) As the electric current through a wire decreases, the magnetic field around the wire becomes stronger.

Answer 1

As the electric current through a wire increases, the magnetic field around the wire becomes stronger. (A)

(That's the reason why, if you want to use your junk-yard electromagnet to lift junk cars, you have to run a huge current through it.)