Power Systems
The fact that current density is higher at the surface when compared to centre is known as

 skin effect
 proximity effect
 carona
All of these

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Power Systems
The advantage of hydro electric power station over thermal power station is

 the operation cost of hydro electric power station is low
 the initial cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year
 hydro electric station can be constructed at the place where the energy is required

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