Two 11.5-mg balls are connected by a 28.9-cm-long insulating rod of negligible mass. one ball has a charge of +q and the other has a charge of −q. the system is placed in a 592 n/c uniform electric field. initially the system is at rest and makes an angle α= 58.9° with respect to the field. it is then released, and when it is momentarily aligned with the electric field, its kinetic energy is 4.86 mj. what is the magnitude of q?

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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