A proton (mass = 1.67 × 10?27 kg, charge = 1.60 × 10?19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 50 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB?VA.
A. +20 V
B. ?20 V
C. ?27 V
D. +27 V
E. ?40 V
Answer: B
Physics & Space Science
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