Draw a diagram to show the pattern of magnetic field lines on a horizontal sheet of paper due to a straight conductor passing through its centre and carrying current vertically upwards. Mark on it (i) the direction of current in the conductor and (ii) the corresponding magnetic field lines. State right hand thumb rule and check whether the directions marked by you are in accordance with this rule or not.
Right-Hand Thumb Rule: If you hold a current-carrying conductor in your right hand with your thumb pointing in the direction of the current, the curl of your fingers shows the direction of the magnetic field lines around the conductor. The diagram shows concentric circles around the conductor representing magnetic field lines, and their directions conform to the right-hand thumb rule.
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