Suggest one way of discriminating a wire carrying current from a wire carrying no current.
(N/A) Bring a magnetic needle near the wire.
$A$ current-carrying wire produces a magnetic field around it,which exerts a force on the magnetic needle,causing it to deflect.
$A$ wire without current does not produce a magnetic field,so the magnetic needle will remain stationary.
$A$ current-carrying wire produces a magnetic field around it,which exerts a force on the magnetic needle,causing it to deflect.
$A$ wire without current does not produce a magnetic field,so the magnetic needle will remain stationary.
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