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 objects move in an electric fields/g+ h+oef*z0+n fx/,m foxtc0vk 0pu along p0u9:i9wwk3 ++kf ab )f5ni*bozjrh ewaths shown as arrows below. Equipotentiaw3aoe0+jbuzn *fiw: h+wk 5 rbik99f )l lines for the field are shown. Initially, 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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