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The figure below shows a circuit with an open switch, an emf device, ? = 21 v, and resistor, R = 72 ?. If we

The figure below shows a circuit with an open switch, an emf device, ? = 21 v, and resistor, R = 72 ?. If we assume the switch remains open, use the given values to find the potential difference between the following points.

a d 3 + b C R

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