Apositively charged rod is brought close to a grounded metal sheet without touching. two experiments are done: experiment a: the charged rod is first taken far away and then the metal sheet is disconnected from ground. experiment b: the metal sheet is first disconnected from ground and then the charged rod is taken far away. which statement is true regarding the net charge of the metal sheet at the end of the two experiments? hint: draw what is happening at each step. the metal sheet is neutral at the end of both experiments oa: neutral b: negative oa: neutral b: positive the metal sheet is positively charged at the end of both experiments. the metal sheet is negatively charged at the end of both experiments. o a: positive b: neutral o a: negative b: neutral

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