SAT Physics Problem

Help needed with the use of Right Hand Rule.
I’ve been studying British Curriculum in which according to the books, the thumb represents force,First Finger Field and Second Finger Current.
While on the other hand, the SAT has totally opposite.Can anyone explain me the basics?
I did learned the SAT method but the problem is when in Chapter 12 “MOTIONAL EMF” thew eg given I can’t understand how the Force is downwards.