Special Relativity - Lorentz Force Law

[Nusc]

Homework Statement

Show that the 4-force law: F_u=q/c E_{uv}U^v leads to the usual Lorentz force law.

Homework Equations

F = E + v x B.

The Attempt at a Solution

What's U?

 

[Phrak]

U^v looks like a four velocity with a raised index. What is E_uv?

 

[Nusc]

I have no idea, the question doesn't say.

 

[Nusc]

Anyone else have an idea?