The charges present on the various objects are as shown in the figure below. In which of the following cases, a force of repulsion acts between them?

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The charges present on the various objects are as shown in the figure below. In which of the following cases, a force of repulsion acts between them?<br><img src='https://www.fatskills.com/images3/olympiad/class-8-science-10-19.GIF'>