Fields D.1 Gravitational Fields & Potential (id: 7d2371aaf)

本题目来源于试卷: Fields D.1 Gravitational Fields & Potential ，类别为 IB物理学

[单选题]

The diagram shows the equipotential lines in a field due to A and B. What may be represented 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:
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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