Fields D.2 Electromagnetic Fields & Potential (id: 140bef944)

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

[单选题]
Four identical negatively charged objefdxefnrw0o+;w *7 ky +cts move in aau/2w3xc aprim-9(:y+ k abmd n electric field along paths shown as arrows below. Equipotential lines for the field are shown. Initiall/(3ay- rxamb pacm 9: +dikw2uy, all four objects have the same kinetic energy.

What is the relationship between the kinetic energies of the objects at the end of their paths?

A. I = IV > III > II
B. I > IV = II > III
C. I = II = IV >III
D. I > IV > III > II


参考答案:  A


本题详细解析:

Explanation​:

Work done on a charge = qΔV.

For I, III and IV the work done is positive, therefore kinetic energy increases.

For II the work done is negative, therefore kinetic energy decreases.

For I and IV, ∆V is equal so the increase in kinetic energy is the same, and this increase is larger than that for III.

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