Four square enclosures

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Four square enclosures, each of side

0.50\,\text{m}

, are proposed to shield a sensitive detector from a

5\,\text{kHz}

magnetic field. Which enclosure will provide the greatest attenuation due purely to eddy currents? (a)

3\,\text{mm}

thick laminated steel sheet (b)

3\,\text{mm}

thick aluminium sheet (c)

3\,\text{mm}

thick copper sheet (d)

1\,\text{mm}

thick copper sheet