Ans. (c) (13 define s,= (f+f), and where are pauli spin matrices and , ft obey anticommutation relations { f 0, a =0, us"}1. then s, is given by (a) ftf-i 3) 2f

Ans. (c) (13 Define s,= (f+f), and where are Pauli spin matrices and , ft obey anticommutation relations { f 0, A =0, US"}1. Then s, is given by (a) ftf-I 3) 2ftf+1 (b) 2f1 f-1 (4) ftf An JEST-20121 Ans b) 6Consider a spin-1/2 particle in the presence of a