Fields D.2 Electromagnetic Fields & Potential (id: d4bda8d4e)

本题目来源于试卷: Fields D.2 Electromagnetic Fields & Potential，类别为 IB物理学

[单选题]
The work done on a betznaqxx(kuj,)ut p1ir y50z f,9 qqt: 1a-minus particle when moving8e/g*za 4w rsme0h/*l- gvd ss it from Y to X is found to be −10eV. Equipotential lines are represented byrew*gs/ em-4g/ hzds8s0val* the dashed lines in the diagram.
What is the work done by the field on an electron when it is moved from Z to W in the field shown?

A. +10eV
B. −10eV
C. −20eV
D. +20eV


参考答案:  B


本题详细解析:

Explanation​:

A beta-minus particle is the same as an electron, so the particles have the same charge.

Z and X are on the same equipotential line, and Y and W are on the same equipotential line, therefore the magnitudes of the changes in potential will the same.

Moving a particle from Y to X requires −10eV of work, which means that  +10eV of work is done on the beta-minus particle by the field.

Y to X and Z to W are opposite paths to each other, so the work done by the field on the same particle will be the negative of the work done by the field in the first situation, therefore −10eV.

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