A proton (m = 1.7 × 10?27 kg, q = +1.6 × 10?19 C) starts from rest at point A and has a speed of 40 km/s at point B. Only electric forces act on it during this motion. Determine the electric potential difference VB?VA.
A. +8.5 V
B. ?8.5 V
C. ?4.8 V
D. +4.8 V
E. ?17 V
Answer: B
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Point charges q and Q are positioned as shown. If q = +2.0 nC, Q = ?2.0 nC, a = 3.0 m, and b = 4.0 m, what is the electric potential difference, VA ? VB?
a.
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b.
6.0 V
c.
7.2 V
d.
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e.
0 V