Which of the following statements is NOT correct?
A galvanometer can be converted to an ammeter with a different range by connecting a high resistance in series
An electric current always produces a magnetic field
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
Electromagnets are used in electric bells and telephone recievers
The lines of force round a straight current carrying conductor are circular
Correct answer is A
No explanation has been provided for this answer.