A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by; 1) Left-hand thumb rule for up-current and right-hand thumb rule for down-current.; 2) Right-hand thumb rule for up-current and left-hand thumb rule for down-current.; 3) Right-hand thumb rule for both up and down currents.; 4) Left-hand thumb rule for both up and down currents.
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Right hand thumb rule is used here
When you predict your hand is a conductor and the thumb is the direction of current and the fingers wrapped around is the magnetic field lines of lines of force
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