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

Correct Answer: Option A

Explanation:

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