An Alpha Particle (M = 6

Multiple Choice

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 V_A − V_B.

A) +4.2 V
B) −4.2 V
C) −9.4 V
D) +9.4 V
E) −8.4 V