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# The direction of magnetic lines of force produced by passing a direct current through a conductor is determined by

$\begin {array} {1 1} (a)\;Lenz’s \: Law & \quad (b)\;Right\: Hand\: Screw\: Rule \\ (c)\;Fleming’s\: Right\: Hand\: Rule & \quad (d)\;Fleming’s \: Left\: Hand \: Rule \end {array}$

Factual Question
Ans : (b)