A proton (+1.6 × 10^?19 C) moves 15.0 cm along the direction of an electric field of strength 3.0 N/C. The electrical potential difference between the proton's initial and ending points is:
a. 4.5 × 10^?19 V.
b. 0.45 V.
c. 24 V.
d. 0.55 V.
e. zero
b
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