A cavity inside a conductor is shielded from outside electrical influences It is worth noting that electrostatic shielding does not work the other
way round; that is, if you put charges inside the cavity, the exterior of
the conductor is not shielded from the fields by the inside charges EXERCISES
2 1
Two charges 5 × 10–8 C and –3 × 10–8 C are located 16 cm apart