An Alpha Particle (M = 6

question 3

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 VA -VB.

• A)+4.2 V
• B)(-4.2 V)
• C)(-9.4 V)
• D)+9.4 V
• E)(-8.4 V)

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