How long is a tungsten wire if it has a diameter of 0.103 × 10 − 3 m and a resistance of 2150 Ω ? The resistivity of tungsten is 5.62 × 10 − 8 Ω ⋅ m .

317.5m

Explanation:

The detailed solution is shown in the image attached. The crossectional area of the wire is first obtained from the diameter of the wire which was given in the question. We apply the fact that half the diameter is equal to the radius. We then apply the formular shown in the solution to obtain the length of the wire.

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