I need help with these questions please only answer if you know it not for the points .

b

explanation:

bc its just b

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

d.7.5cm is your answer

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j