If a box has equal and opposite forces acting on it, will the box accelerate?

No

Imagine your hold a cube (imagine the fists are just hands pushing and the face is the box) it will not move as the are evening each other out

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.