The net force on +q in Case A is:
Understand the Problem
The question is asking about the comparison of the net force acting on a charge +q in two different cases (A and C) based on their arrangements with other charges +Q. It requires evaluating the forces based on their geometry and symmetry.
Answer
Smaller than the net force in Case C.
The net force on +q in Case A is smaller than the net force in Case C.
Answer for screen readers
The net force on +q in Case A is smaller than the net force in Case C.
More Information
In Case A, the forces exerted by the two +Q charges on +q are resolved into vertical components, which partially cancel out, leading to a smaller net force. In Case C, the forces are directly additive.
Tips
A common mistake is to ignore the components of forces when analyzing symmetry. Always resolve forces into components and consider cancellations.
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