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Problem: A parallel-plate capacitor is designed so that the plates can be pulled apart. The capacitor is initially charged to a potential difference of 150 Volts when the plates are 1.0 mm apart. The plates are insulated so that the charge cannot leak off.

Part A: What is the potential difference between the plates when they are pulled to a new separation 2.5 mm apart?

Please give me an explanation for above problem.

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