Which of the following statements is NOT correct?

• A.A galvanometer can be converted to an ammeter with a different range by connecting a high resistance in series
• B.An electric current always produces a magnetic field
• C.Maxwell's screw rule states that if a corkscrew moves inthe direction of the current, the hand turns in the direction of the lines of force
• D.Electromagnets are used in electric bells and telephone recievers
• E.The lines of force round a straight current carrying conductor are circular