A long wire with a radius of 0.400 cm carries a current. The potential difference across a 2.90 m long section of this wire is 13.0 V, and the wire carries a current of 0.360 A. Required:
a. What is the resistance in Ω of the 3.20 m long section of wire?
b. What is the resistivity of wire?

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

explanation:

the masses of the objects and the distance between them