Awire, a, is running along the y-axis, and a square (3 cm x 3 cm) loop of wire, b, is oriented in the yz plane above a so that the bottom edge of b is 6 cm above a. in wire a, the current can be modeled by the equation i-l, sin o t, where i, (5.0 a) is the maximum current o (-0.7 s) is the angular frequency, and positive la indicates the current is flowing in the +y direction. the resistance in b is 9.20 a) what is the induced emf in b? b) how can b be positioned and oriented so that the closest points in apart and there is no induced current? and b are still 5 cm

heats surface water up

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

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide