(a) i. It increases
ii. It decreases
iii. It stays the same
(b) i. A circle
ii. A horizontal line
iii. A vertical line
iv. A squareSection 1 - Electric potential energy
1.1 A system consisting of two positive particles is altered by an outside force so that its potential energy increases by 5.4 μJ.
There is no change in kinetic energy between the initial and final states of the system. (a) What is the work done by the
outside force? (b) What is the work done by the electric force? (c) Are the particles closer together or farther apart after the
system's rearrangement?(a) μJ
(b) μJ
(c) i. Closer together
ii. Farther apart
iii. No change
1.2 A system consisting of one positively charged particle and one negatively charged particle is altered by an outside force so
that its potential energy increases by 6.25 mJ. There is no change in kinetic energy between the initial and final states of the
system. (a) What is the work done by the outside force? (b) What is the work done by the electric force? (c) Are the particles
closer together or farther apart after the system's rearrangement?(a) mJ
(b) mJ
(c) i. Closer together
ii. Farther apart
iii. No change
1.3 A system consisting of two positive particles is altered by an outside force so that its potential energy decreases by 52.3 J.
There is no change in kinetic energy between the initial and final states of the system. (a) What is the work done by the
outside force? (b) What is the work done by the electric force? (c) Are the particles closer together or farther apart after the
system's rearrangement?
(a) J
(b) J
(c) i. Closer together
ii. Farther apart
iii. No changeSection 2 - Sample problem: electric potential energy
2.1 A system consists of a uniform electric field of 73.5 N/C, directed in the positive x direction, together with a particle having a
positive charge of 3.46×10í^5 C. The particle is moved from the location x = 3.50 m to the location x = 1.50 m in the field, and it
is stationary before and after it is moved. (a) What is the work done on the system by the external force? (b) What is the work
done by the field on the particle? (c) What is the change in the potential energy of the system?
(a) J
(b) J
(c) J
2.2 A system consists of a uniform electric field of 42.6 N/C, directed in the positive x direction, together with a particle having a
positive charge of 7.87×10í^6 C. The particle is moved from the location x = 1.50 m to the location x = 3.50 m in the field, and it
is stationary before and after it is moved. (a) What is the work done on the system by the external force? (b) What is the work
done by the field on the particle? (c) What is the change in the potential energy of the system?
(a) J
(b) J
(c) J
2.3 A system consists of a uniform electric field of 2.50 N/C, directed in the positive x direction, together with a particle having a
negative charge of 5.50 mC. The particle is moved from the location x = 1.50 m to the location x = 3.50 m in the field, and it is
stationary before and after it is moved. (a) What is the work done on the system by the external force? (b) What is the work
done by the field on the particle? (c) What is the change in the potential energy of the system?(^452) Copyright 2007 Kinetic Books Co. Chapter 24 Problems