Question
Two point charges q1=+2.65nC and q2=−6.80nC are 0.100m apart. Point A is midway between them; point B is 0.080m from q1 and 0.060m from q2. The potential at point A is V=-746.
A. Find the potential at point B. Express your answer in volts to three significant figures.
B. Find the work done by the electric field on a charge of 2.65nC that travels from point B to point A Express your answer in joules to two significant figures.
C. A 10.0 μF parallel-plate capacitor is connected to a 12.0 V battery. After the capacitor is fully charged, the battery is disconnected without loss of any of the charge on the plates. A voltmeter is connected across the two plates without discharging them and reads 12.0 V. What would the voltmeter read if the plate separation were doubled? What would the voltmeter read if the radius of each plate was doubled, but the separation between the plates was unchanged?

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Answer #1

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