"Towards south" is the one among the following choices given in the question that is the direction of the magnetic force on the moving positive charge. The correct option among all the options that are given in the question is the second option or option "B". I hope that the answer has actually come to your help.
Thomas was most important because he discovered the electron and proposed the plum pudding model of the atom where there's a dispersed positive charge with electrons sitting in it. He was most important because without him Rutherford wouldn't have done his gold foil experiment to test that alpha particles pass through or atoms and discover the positive nucleus, and then bohr wouldn't have figured out that electrons have energy levels without Rutherford discovery of the positive nucleus
