E4E07 - Amateur Extra Class

E4E07 : Which of the following can cause shielded cables to radiate or receive interference?
A Low inductance ground connections at both ends of the shield
B Common-mode currents on the shield and conductors
C Use of braided shielding material
D Tying all ground connections to a common point resulting in differential-mode currents in the shield
Correct Answer: Common-mode currents on the shield and conductors