[单选题]
Four identical negat
p.gprm 6-if-nzh i,e*iv
-pvo doxw1y. gg2w9u7ely charged objects move in an electric field along paths shown as arrows below. Equipotential lines for the field are shown.
y.w d9wv721xo-u gpgoInitially, 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.
