Electric current in a metal wire is due to the flow of — (1) Electrons (2) Protons (3) Ions (4) Holes

Electric current in a metal wire is due to the flow of — (1) Electrons (2) Protons (3) Ions (4) Holes
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(1) Electrons Explanation: A solid conductive metal contains mobile, or free electrons, originating in the conduction electrons. When a metal wire is connected across the two terminals of a DC voltage source such as a battery, the source places an electric field across the conductor. The moment contact is made, the free electrons of the conductor are forced to drift toward the positive terminal under the influence of this field.
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