(a) Explain qualitatively why a solid copper sheet provides better attenuation for a…
PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
(a) Explain qualitatively why a solid copper sheet provides better attenuation for a 10kHz alternating magnetic field than for a 50Hz field of the same amplitude.
(b) High-end medical imaging rooms are often lined with large copper sheets embedded inside the walls. Identify two design features that ensure these sheets act as effective shields against external time-varying magnetic fields.
(c) If, instead of a solid wall, a lattice of thin copper wires were used, give two reasons why the shielding would be much less effective at high frequencies.