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Draw the pattern of the field lines of the magnetic field around a current carrying straight conductor passing through and held perpendicular to a horizontal cardboard. State right-hand thumb rule and explain how this rule is useful to determine the direction of the magnetic field in the above case, if the direction of current in the conductor is vertically downwards.




Maxwell’s Right Hand Thumb rule states that, if we point the thumb of our right hand in the direction of the current, then the direction in which our fingers curl gives the direction of the magnetic field. 

In this case, the current is flowing vertically downwards , so the magnetic field will be in the clockwise direction.  

Right Hand Thumb Rule When Direction of Current is Reversed - Teachoo.jpg

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo