
Concept explainers
(a)
What is the change in the electric potential energy.
(a)

Answer to Problem 94P
The change in electrical potential energy is
Explanation of Solution
Write the equation to find the electric potential energy at point b.
Here,
Both charges are of equal magnitude but sign is opposite.
Substitute
Similarly find the potential energy at point c.
Rewrite equation (II) to find
Take the difference between equation (II) and (III) to find the difference in potential energy.
Conclusion
Substitute
Substitute
Substitute
Therefore, the change in electrical potential energy is
(b)
What is the work required to move charge from point a to point b.
(b)

Answer to Problem 94P
The work required to move charge from point a to b is
Explanation of Solution
Work done is equal to the change in electrical potential energy.
Write the equation to find the potential energy at point a.
Here,
Both charges are of equal magnitude but sign is opposite.
Substitute
Write the equation to find the work done.
Conclusion:
Substitute
Substitute
Therefore, The work required to move charge from point a to b is
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Chapter 17 Solutions
Physics
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