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(C) For a steady electric current to flow through a conducting wire,there must be a potential difference across its ends.According to the relation $E

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Inside the wire but parallel to it

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(C) For a steady electric current to flow through a conducting wire,there must be a potential difference across its ends.According to the relation $E = V/L$,where $E$ is the electric field,$V$ is the potential difference,and $L$ is the length of the wire,an electric field must be present inside the conductor.This electric field is responsible for the drift velocity of the charge carriers (electrons).Since the current flows along the length of the wire,the electric field must also be directed along the length of the wire,i.e.,parallel to it.Therefore,the correct option is $C$.

When there is an electric current through a conducting wire along its length,then an electric field must exist

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