1. A 20 µF capacitor has a potential difference of 9.0 V applied across its plates. If the potential difference across its plates is increased to 12.0 V, how much ADDITIONAL energy does the capacitor store? 2. Each plate of a parallel-plate air-filled capacitor has an area of 0.0020 m2, and the separation of the plates is 0.020 mm. An electric field of 3.9x106 V/m is present between the plates. What is the surface charge density on the plates?
1. A 20 µF capacitor has a potential difference of 9.0 V applied across its plates. If the potential difference across its plates is increased to 12.0 V, how much ADDITIONAL energy does the capacitor store? 2. Each plate of a parallel-plate air-filled capacitor has an area of 0.0020 m2, and the separation of the plates is 0.020 mm. An electric field of 3.9x106 V/m is present between the plates. What is the surface charge density on the plates?
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Question
2
![1. A 20 µF capacitor has a potential difference of 9.0
V applied across its plates. If the potential difference
across its plates is increased to 12.0 V, how much
ADDITIONAL energy does the capacitor store?
2. Each plate of a parallel-plate air-filled capacitor
has an area of 0.0020 m2, and the separation of the
plates is 0.020 mm. An electric field of 3.9x106 V/m
is present between the plates. What is the surface
charge density on the plates?
HINT: E = (where E = electric field, V =
Potential difference/Noltage, and d = distance
between plates)
Also note that 1 N/C = 1 V/m. (V/m is just
another unit for electric field)
3. Thirteen resistors are connected across points
A and B as shown in the figure. If all the resistors are
accurate to 2 significant figures, what is the
equivalent resistance between points A and B?
20 20
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Transcribed Image Text:1. A 20 µF capacitor has a potential difference of 9.0
V applied across its plates. If the potential difference
across its plates is increased to 12.0 V, how much
ADDITIONAL energy does the capacitor store?
2. Each plate of a parallel-plate air-filled capacitor
has an area of 0.0020 m2, and the separation of the
plates is 0.020 mm. An electric field of 3.9x106 V/m
is present between the plates. What is the surface
charge density on the plates?
HINT: E = (where E = electric field, V =
Potential difference/Noltage, and d = distance
between plates)
Also note that 1 N/C = 1 V/m. (V/m is just
another unit for electric field)
3. Thirteen resistors are connected across points
A and B as shown in the figure. If all the resistors are
accurate to 2 significant figures, what is the
equivalent resistance between points A and B?
20 20
wwwwww
22 20
wwwww
www
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