Correct Answer - Option 1 : Al
In the given options, Aluminium has the lowest conductivity so It has the highest skin depth.
Option(1) is correct.
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Metal
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Conductivity in (siemens/m)
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Silver
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6.3 × 107
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Copper
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5.96 × 107
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Aluminium
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3.5 × 107
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gold
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4.42 × 107
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Skin depth:
It is defined as the depth in the conductor where the current density is \(\frac{1}{e}\) of its value at the surface.
It is denoted by δ
\(\delta = \frac{1}{{\sqrt {\pi f\mu \sigma } }}\)
Where σ = conductivity
⇒ \(\delta \propto \frac{1}{{\sqrt \sigma }}\;\;\sigma \uparrow \delta \downarrow \)
