question_answer

    State the rule to determine the direction of a                                    (a) magnetic field produced around a straight conductor carrying-current. (b) force   experienced  by  a  current- carrying straight conductor placed in a magnetic field. (c) current induced in a coil due to its rotation in magnetic field.

Answer:

                  (a) Ampere's Right-Hand Thumb Rule If current is passing through a conductor in the direction of thumb of the right hand, then the direction of magnetic field is given by that of curvature of fingers.                                        (1) (b) Fleming's Left-Hand Rule If the forefinger, centre finger and thumb of left hand are stretched mutually perpendicular and forefinger points in the direction of magnetic field, centre finger points in the direction of flow of electric current, then thumb points in the direction of force acting on the conductor (1) (c) Fleming's Right-Hand Rule If the forefinger, centre finger and thumb of right hand are stretched mutually perpendicular and forefinger points in direction of magnetic field, thumb points in the direction of motion of conductor, then centre finger points in the direction of induced current.                         (1)