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Electric Field inside a Conductor under Electrodynamic Conditions

Question

Electric current arises from the flow of charged particles. Now
In semiconductors it is jointly due to flow of holes and electrons
In electrolytes it is due to flow of negative ions only
In metals it is dominant due to flow of electrons
In discharge tubes containing gases at low pressure it is due to flow of positive ions only

A

In metals it is dominant due to flow of electrons

B

In semiconductors it is jointly due to flow of holes and electrons

C

In electrolytes it is due to flow of negative ions only

D

In discharge tubes containing gases at low pressure it is due to flow of positive ions only

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Solution

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Conductors have lots of free electrons for conduction, so in metals electrons mostly contribute to current not the heavy ionised atom.
In case of a semiconductor their are holes and electrons both responsible for conduction although movement of holes is indirectly movement of electrons only.

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