UPSC NDA I 2013 General Ability Paper

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Question : 94 of 150

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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 :

left-hand thumb rule for up-current and right-hand thumb rule for down-current
right-hand thumb rule for up-current and left-hand thumb rule for down-current
right-hand thumb rule for both up and down currents
left-hand thumb rule for both up and down currents

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