Power Systems
Non-commercial sources of energy are

 fossil fuel, hydro power and nuclear power.
  wood, animal wastes and agricultural wastes.
 solar, wind and biomass.
None of these

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Power Systems
The skin effect shows that

 current density is more at the surface of the condutor
 current density is lower at the surface of the condutor
 the distribution of AC current is uniform through the cross section of the conductor
 current density is more at the centre of the condutor

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