A shield for computer circuitry is made from a highly permeable substance to do what?

A shield for computer circuitry is made from a highly permeable substance to do what?

• A. To reflect light
• B. To conduct electricity
• C. To insulate against heat
• D. To trap the lines of magnetic flux inside the shield

Answer: (D)

The main idea is magnetic shielding: a material with very high magnetic permeability provides a path of least reluctance for magnetic field lines. When a shield surrounds sensitive circuitry, external magnetic fields preferentially pass through the shield rather than through the interior. This concentrates the flux inside the shield material and keeps it away from the electronics, effectively reducing the magnetic field inside the protected area. This is why a highly permeable shield is used—to trap or redirect lines of magnetic flux so they don’t interfere with the circuitry. It isn’t about reflecting light, conducting electricity, or insulating against heat.

The main idea is magnetic shielding: a material with very high magnetic permeability provides a path of least reluctance for magnetic field lines. When a shield surrounds sensitive circuitry, external magnetic fields preferentially pass through the shield rather than through the interior. This concentrates the flux inside the shield material and keeps it away from the electronics, effectively reducing the magnetic field inside the protected area. This is why a highly permeable shield is used—to trap or redirect lines of magnetic flux so they don’t interfere with the circuitry. It isn’t about reflecting light, conducting electricity, or insulating against heat.