An alpha particle (m = 6.7 × 10−27 kg, q = +3.2 × 10−19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle during this motion. Determine the electric potential difference VA − VB.
A) +4.2 V
B) −4.2 V
C) −9.4 V
D) +9.4 V
E) −8.4 V
Correct Answer:
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