Question 37
A student tests rods X, Y and Z in circuit positions P1, P2 and P3. Trial 1: P1=X, P2=Y, P3=Z; B1 on, B2 off, B3 off. Trial 2: P1=Y, P2=Z, P3=X; B1 off, B2 on, B3 off. Trial 3: P1=Z, P2=X, P3=Y; B1, B2 and B3 all on. Which conclusion is correct?
