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Question

The effect owing to which a conductor carries more current on the surface as compared to the core is known as :

A.

Corona 

B.

Ferranti effect 

C.

Skin effect 

D.

Permeability 

Answer ( Option C)

Skin effect 

Solution

It is seen that resistance of AC is slightly greater than resistance of DC (RA.C.> RD.C.). It is due to the phenomenon of skin effect. In skin effect the resistance of centre part of the conductor is more than that of circumference.

Thus current at the surface is greater than centre part of the conductor, this phenomenon is called skin effect

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