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(i) A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. Copy the diagram and show the setting of iron filings when a current is passed through the wire in the upward direction and the cardboard is tapped gently. Draw arrows to represent the direction of the magnetic field lines. 

(ii) Name the law which helped you to find the direction of the magnetic field lines. 

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(i)

(ii) Right hand thumb rule helped to find the direction of magnetic field lines.

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