Fields D.2 Electromagnetic Fields & Potential (id: d755e6215)

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 diagram shows the equipotenti.qvr,bi6re;fe r2 e3sal lines in a field due to A and B. What may +zp/1c jd8cfc0 rlh6ebe repres 1rez pdlh0/cc 6+8jfcented by A and B?

I. 2 equal masses.
II. 2 equal charges of the same sign.
III. 2 equal charges of opposite sign

A. Only $I$
B. $ I$ and $III$ only
C. Only $III$
D. $ I$,$II$, and $III$


参考答案:  C


本题详细解析:

$\underline{\text{Explanation}}$:
Equipotential lines are perpendicular to field lines, which means the field lines must be directed from A to B or vice versa. That is only possible for 2 charges with opposite sign. In I and II, the forces from the two objects would be in opposite directions, giving a resultant field zero at the midpoint, and equipotential lines of a “peanut” shape.

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