<h3>Explanation</h3>
,
where
is the current;
is the drift speed;
is the cross-section area of the wire, 
is the number of charge carrier per unit volume, and
is the charge on each charge carrier.
Area of a circular cross-section:
,
where
is the radius of the wire.
and are the same for all four samples, for they are made out of the same material.
As a result, of each wire is directly proportional to 
where the value of 
is constant.
For each of the four wires:
.
How do the four wires rank by their current?
d > a > b > c.
Answer:
Here are a few:
1) The orbital radius of these planets is ridiculously small an in no way representative of their actual radii.
2) The planets will only line up like that once every 5200 years, making this very unrepresentative of their usual relations - although this does make their order in distance from the sun.
3) The nebulae, comet, lens flare, and other junk in the background is incorrect.
4) If this is meant as a representation of the planets, then Pluto should not be there as it is now considered a planetoid.
5) The planets are incorrectly scaled both to each other and to the sun.
Answer:
Here, force=20N and displacement=10m
Work=Force×Displacement=20N×10m=200Nm
