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Question

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

A
inside the wire but normal to it
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B
inside the wire but parallel to it
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C
outside the wire but normal to it
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D
outside the wire but parallel to it
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Solution

The correct option is B inside the wire but parallel to it
As current is flowing through it , it means charges are flowing along its length therefore heir must be some electric field parallel to the length of the wire. Hence correct option is B.

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