A particle (q = +5.0 $\mu$C)is released from rest when it is 2.0 m from a charged particle which is held at rest.After the positively charged particle has moved 1.0 m toward the fixed particle,it has a kinetic energy of 50 mJ.What is the charge on the fixed particle?
A)-2.2 $\mu$C
B)+6.7 $\mu$C
C)-2.7 $\mu$C
D)+8.0 $\mu$C
E)-1.1 $\mu$C

Question

Quizplus · Accepted Answer

The work-energy principle states that the change in kinetic energy is equal to the work done by the electric force. Using Coulomb's law and the given kinetic energy, we can solve for the charge on the fixed particle. The negative sign indicates that the fixed charge is opposite in sign to the moving charge.

A Particle (Q = +5 μ\muμ C)is Released from Rest When It Is 2

A Particle (Q = +5 $\mu$ C)is Released from Rest When It Is 2