re: HSC Physics Marathon Archive
Why is the answer C?
Is it because this a p-n junction?
Don't holes move in opposite direction to electrons?
Somone help please!
Use the right-hand palm rule for the holes, and left-hand (or reverse right-hand) palm rule for the electrons.
With the RHPR, point your thumb in the direction of the holes (conventional current) and fingers in the direction of the magnetic field. Your palm will be facing down, so the holes experience a force downwards.
With the LHPR, point your left thumb in the opposite direction to the holes (i.e. in the direction of the electrons) and fingers in the direction of the magnetic field. Again, your palm will be facing down, so the electrons experience a force downwards.
Thus, both the holes and the electrons move to the bottom of the rod.
(lol rekt, got beaten to it twice)