A 60-$\mu$C charge is held fixed at the origin and a -20-$\mu$C charge is held fixed on the x axis at a point x = 1.0 m.If a 10-$\mu$C charge is released from rest at a point x = 40 cm,what is its kinetic energy the instant it passes the point x = 70 cm?
A)9.8 J
B)7.8 J
C)8.8 J
D)6.9 J
E)2.8 J

Question

Quizplus · Accepted Answer

The change in electric potential energy as the charge moves from 40 cm to 70 cm is converted into kinetic energy. Calculating this change using the formula for electric potential energy between point charges and considering the initial and final positions gives a kinetic energy of 8.8 J.

A 60- μ\muμ C Charge Is Held Fixed at the Origin and a Origin

A 60- $\mu$ C Charge Is Held Fixed at the Origin and a Origin