Answer
120,000 V. 120,000 V.
Work Step by Step
Potential is defined as energy per unit charge, as shown on page 422.
$$V = \frac{PE}{q} = \frac{12 J}{0.0001 C} = 120,000 V$$
$$V = \frac{PE}{q} = \frac{24 J}{0.0002 C} = 120,000 V$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.