Why do most surfaces reflect light diffusely? 1. most surfaces are clear. 2. most surfaces are 100% smooth. 3. most surfaces are not totally smooth. 4. all surfaces are smooth.

The answer is C. Most surfaces are not totally smooth.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it