A proton is released from rest in a region of space with a nonzeroelectric field
ID: 1764915 • Letter: A
Question
A proton is released from rest in a region of space with a nonzeroelectric field. As the proton moves, describe what happens to theelectric potential energy of the system, and to the electricpotential that the proton experiences.The electric potential energy...
(a) increases
(b) decreases
(c) remains constant
[I thought it was (a) since potential energy is the energystored in an object and when the object is released...does it causethe PE to increase?]
As it moves, the proton experiences...
(a) lower electric potential.
(b) higher electric potential.
(c) constant electric potential.
[So since I thought the first answer was that the PE increasesand since electric potential is PE divided by charge, I thoughtthis answer was (b)..]
Repeat the above question starting with an electron atrest. As the electron moves through a nonzero electric field, whathappens to the system's electric potential energy, and to theelectric potential experienced by the electron?
The electric potential energy...
(a) increases
(b) decreases
(c) remains constant
[I'm not exactly sure how it is different if it's an electroninstead of a proton so I'm assuming if my answer to the first oneis correct this one is (a), the PE increases too?]
As it moves, the electron experiences...
(a) lower electric potential.
(b) higher electric potential.
(c) constant electric potential.
[I thought this was (a) lower because the charge is negative onthe electron, so if there's an increased positive PE divided by anegative q, the magnitude of the electric potential might increasebut the negative would make it a lower electricpotential..]
As you can tell, I ultimately need to know if my line of thinkingis correct for the first problem to be able to know if I got theothers correct. Can anyone help me reason through this? Thanks!Will rate lifesaver!
Explanation / Answer
1)option A is correct. [I'm not exactly sure how it is different if it's anelectron instead of a proton so I'm assuming if my answer to thefirst one is correct this one is (a), the PE increases too?] if it is electron potential energy decreases.because in a electricfield there exists force of repulsion between proton and positivecharge and attraction between electron and positive charge. so wehave to perform more work to move a proton rather than anelectron . more work leads to more potential energy. 2)option A is correct. because proton moves from higher to lowerpotential. 3)option B is correct. 4)option B is correct. because in a electric field electron movesfrom lower to higher potential.
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