Question

What did later work by Ampere, Biot, Savart, and Maxwell establish?

Options

• The absence of a magnetic field around Earth

• The existence of isolated magnetic poles in ordinary magnetic materials

• The close relationship between electricity and magnetism

• The intersection of magnetic field lines

Answer 1

Later work by Ampere, Biot, Savart, and Maxwell established the close relationship between electricity and magnetism. Oersted's observation that electric current produces a magnetic effect was an earlier step in this history.