How should the student modify the setup to investigate how a motor works? A. Attach a crank or use a student finger to force the coil of wire to rotate.

B. Remove the magnet from the model.

C. Place an iron nail inside the coil of wire.

D. Replace the lamp with a battery.

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton