Question

Draw the pattern of magnetic field lines due to a current carrying straight conductor. Mark on it the direction of current in the conductor and the direction of the magnetic field developed. Name the rule that helps us to determine the direction of magnetic field lines in this case.

Answer 1

Magnetic field in a straight current-carrying conductor.

Using the right-hand thumb rule, one can detect the direction of magnetic field lines by holding a current-carrying conductor in the thumb position. Curled fingers will indicate the direction of magnetic field lines.