Where does sea-floor spreading take place?
a. convergent boundaries
c. oceanic volcanoes
b. transform boundaries
d. mid-ocean ridges

D. Mid-Ocean Ridges

Sea-floor spreading takes place at mid-ocean ridges.

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2b2t

explanation:

2b2t

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