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 negative/nv/5tk d5t7gre peunj*s7-biev6l .ly charged objects move in an electri2a(;tgk d9lftoa( 7w+u wxll- c field along paths shown as arrows below. Equipotential lines for the field are shown. Initially, all four objects have the same kinetic ew2o;wa +tf adll7x9 ug (tk-l(nergy.

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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