A14.0 gauge copper wire of diameter 1.628 mmcarries a current of 14.0 ma. part a: what is the potential difference across a 2.15 mlength of the wire?
part b: what would the potential difference in part a be if the wire were silver instead of copper, but all else was the same?

for copper potential difference is 2.4871 × V

for silver  potential difference is 2.1256 × V

Explanation:

given data

diameter D = 1.628 mm = 0.001628 m

current = 14.0 mA = 0.0140 A

length L = 2.15 m

to find out

potential difference

solution

we consider here

resistivity of silver =  1.47 × ohm-m

resistivity of copper = 1.72 × ohm-m

so we apply here resistance formula that is

Resistance = ρ × L / A     ...............1

so here area A = πr² = π(0.001628 /2)² = 2.0816 ×   m²

for copper Resistance = ρ × L / A

Resistance = 1.72 ×  × 2.15 / 2.0816 ×  

Resistance = 1.7765 ×  ohm

for silver Resistance = ρ × L / A

Resistance = 1.47 ×  × 2.15 / 2.0816 ×  

Resistance = 1.5183 ×  ohm

so

potential difference  is calculated as

for copper potential difference  = current × resistance

potential difference  = 0.0140 ×1.7765 ×

potential difference  = 2.4871 × V

for silver  potential difference  = current × resistance

potential difference  =  0.0140 × 1.5183 ×

potential difference  =  2.1256 × V

truck y has a greater velocity than truck x.

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