Đặt điện tích q=2.10-5C tại gốc tọa độ O của hệ trục Oxy. Xét hai điểm A(6;0) và B(3;4) trên hệ trục có đơn vị đo là cm. Chọn gốc điện thế ở vô cùng. Tính công của lực điện trường khi dịch chuyển điện tích q=-1uc từ A đến B

answer: 0.20

explanation: this can only be the answew because all the other measuremnets are not close

a coal burning power plant

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