What was Mme Forestier's reaction when the necklace was returned?

Explanation:

Mme. Forestier's reaction when the necklace was returned was one of anger. She was not pleased that it took so long to get back because she may have needed to wear it sooner.

She said ; "You ought to have brought it back sooner; I might have needed it."

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).