A proton falls through a potential drop of 400 V. How much is the change of potential energy of this proton in falling through this potential drop?
A) 6.4 × 10-16 J
B) -6.4 × 10-16 J
C) 17 × 10-16 J
D) -4000 J
E) 4000 J
Correct Answer:
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