Suggested Problems from Chap 17
What is the potential energy if a third point charge q = - 4.2 nC is placed at point a?
In the diagram, how much work is done by the electric field as a third char3e q = + 2.00
nC is moved from infinity to point a?
Find the electric field and the potential at the center of a square of side 2.0 cm with
charges of + 9.0 µ C at each corner. 17-25
Charges of + 2.0 nC and - 1.0 nC are located at opposite corners, A and C, respectively,
of a square which is 1.0 m on a side. What is the electric potential at a third corner, B, of
the square (where there is no charge)?
(a) Find the potential at points a and b in the diagram for charges Q 1= + 2.50 nC and Q 2
= - 2.50 nC. (b) How much work must be done by an external agent to bring a point
charge q from infinity to point b?
An electron is accelerated from rest through a potential difference ∆V. If the electron
reaches a speed of 7.26 × 10 6 m/s, what is the potential difference? Be sure to include
the correct sign. (Does the electron move through an increase or a decrease in
An alpha particle (charge +2e) moves through a potential difference ∆V = - 0.50 kV. Its
initial kinetic energy is 1.20 × 106J. What is its final kinetic energy?