Which of the following is true regarding the magnetic field due to current in a straight conductor? * A)The magnetic field lines form concentric circles near the straight conductor, with their common centre lying on the straight conductor. B)The magnitude of the magnetic field produced at a given point decreases as the current through the straight conductor increases. C)The magnetic field produced by a given current in the conductor increases as the distance from it increases. D)If the direction of current through the straight conductor is reversed, then the direction of magnetic field lines remains unchanged.
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