If supply frequency increases, the
skin depth is
Decreased
Increased
Remain same
None of these
Increased
Skin effect : Flowing through a conductor, Alternating Current (AC) becomes distributed such that the current density is largest near the surface of the conductor and decreases exponentially with greater depths in the conductor. This phenomenon is known as Skin effect.
●Skin
depth depends upon the frequency of alternating current, as frequency
increases, current flow moves to the surface, resulting in less skin depth.
●Skin
effect reduces the effective cross-section of the conductor and thus increases
its effective resistance.
Hence, the correct option is (B).
&Key Points:-
The
general formula for the skin depth when there is no dielectric or magnetic loss
is
Where, 
= Resistivity of
conductor
= Angular frequency of
current = 
where f is frequency
= Permeability of
conductor
= Permittivity of
conductor.
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