Concept explainers
A proton is released from rest in a uniform electric field. Determine whether the following quantities increase, decrease, or remain unchanged as the proton moves. Indicate your answers with I (increase), D (decrease), or U (unchanged), respectively. (a) The electric potential at the proton’s location (b) The proton’s associated electric potential energy (c) Its kinetic energy (d) Its total energy.
(a)
Answer to Problem 1CQ
Explanation of Solution
A particle with positive charge moves from higher potential to lower potential. Therefore, as the proton move, electric potential decreases.
Conclusion:
(D) The electric potential at proton’s location decreases.
(b)
Answer to Problem 1CQ
Explanation of Solution
The proton moves from higher potential to lower potential. It accelerates towards the negative potential causing its kinetic energy to increase. Therefore, its potential energy decreases.
Conclusion:
(D) The electric potential energy decreases.
(c)
Answer to Problem 1CQ
Explanation of Solution
The proton moves from higher potential to lower potential. It accelerates towards the negative potential causing its kinetic energy to increase.
Conclusion:
(I) The kinetic energy increases.
(d)
Answer to Problem 1CQ
Explanation of Solution
Increase in kinetic energy is accompanied by decrease in potential energy. Thus, the total energy which is the sum of kinetic and potential energy will be constant.
Conclusion:
(U) The total energy is unchanged.
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Chapter 16 Solutions
College Physics
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