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1) Two point charges of magnitude +4.0 microC and -4.0 microC are placed as shown in...

1) Two point charges of magnitude +4.0 microC and

1) Two point charges of magnitude +4.0 microC and -4.0 microC are placed as shown in Figure 20-12. What is the potential difference between points A and B?

2)  Two point charges of magnitude +4.0 microC and -4.0 microC are placed as shown in Figure 20-12. An additional charge of magnitude of +2.0 microC is placed at point A. What is the electric potential energy of this system of charges?

Please show work, Thank you!!!

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