Which statement best describes the relationship between shielding and susceptibility to inductive fields in telecom circuits?

• A. Higher shielding reduces susceptibility.
• B. Shielding has no effect on susceptibility.
• C. Shielding increases susceptibility.
• D. Shielding only affects thermal performance.

Answer: (A)

Shielding reduces the amount of external magnetic energy that can couple into telecom circuits. Inductive fields create voltages in loops and conductors; a well-designed shield—properly grounded and continuous—acts as a barrier and a sink for induced currents, so less field penetrates inside and less unwanted voltage is induced. Therefore, increasing shielding lowers susceptibility to inductive fields.

If shielding is poor or has gaps, its protective effect diminishes, but the overall principle remains: more shielding generally means less susceptibility. The other statements don’t fit because shielding does affect susceptibility, and its role isn’t limited to thermal effects or inherently increasing susceptibility.