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- Electromagnetic Theory
- Electromagnetic Wave Propagation
- Planes Waves in Good Conductor
- Skin Depth

This question was previously asked in

ISRO Scientist EC 2014 Official Paper

- Aluminum
- Gold
- Silver
- Copper

Option 1 : Aluminum

Free

ISRO Scientist ECE: 2020 Official Paper

361

80 Questions
240 Marks
90 Mins

In the given options, Aluminium has the lowest conductivity so It has the highest skin depth.

Option(1) is correct.

Metal |
Conductivity in (siemens/m) |

Silver |
6.3 × 10 |

Copper |
5.96 × 10 |

Aluminium |
3.5 × 10 |

gold |
4.42 × 10 |

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

⇒ \(\delta \propto \frac{1}{{\sqrt \sigma }}\;\;\sigma \uparrow \delta \downarrow \)

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