A charge at rest shows pure E. You boost past it. What do you measure?

• Pure E still, frames change nothing
• A mix of E and B
• Pure B only

What does the field tensor F contain?

• Only the electric field
• Only the magnetic field
• Electric and magnetic parts together

Charge density and current form a single four-vector.

Circle one:   True   False

Gauss and Ampere-Maxwell laws come from which equation?

• The divergence of F tied to the four-current
• The antisymmetric-derivative equation
• A gauge condition

Which tensor equation covers the source-free pair of Maxwell laws?

• The antisymmetric-derivative equation
• The continuity equation alone
• The divergence equation tied to J

F is antisymmetric and 4 by 4. Type how many independent components it holds.

Answer: ______________

A problem mixes frames and asks for final E and B. What is the safe strategy?

• Split into E and B first, then transform pieces
• Write F and J, transform, split at the end
• Guess the mixture from symmetry alone

A student says new physics entered because B appeared after a boost. What is wrong?

• B never appears in any frame
• Boosts cannot change any measurement
• The same tensor merely shows mixed in the new frame