Question

2. Energy and Capacitance

a. Calculate the electric potential energy stored in a 1.7 x 10^-11 F capacitor that stores 3.40 x 10^-10 C of charge at 20.0 V.

b. Two positive charges are brought closer together. Write one or two sentences to describe the work done and the energy conversion that occurs.

c. Calculate the capacitance of a system that stores 8.0 x 10^-10 C of charge at 25.0 V.

Answer #1

A 165 μF capacitor is used in a circuit.
How much energy, in joules, is stored in it when 117 V is
applied?
&
A nervous physicist worries that the two metal shelves of his
wood frame bookcase might obtain a high voltage difference if
charged by static electricity, perhaps produced by friction.
What is the capacitance of the empty shelves if they have area
1.4 × 103 cm2 and are 0.22 m apart in F?
What is the potential...

Two squares of copper are separated by 6 x 10-6
meters and have a capacitance of 8 nF. (Only air is between the
squares.) A) What is the area of each plate? The plates
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plates? C) What is the potential energy stored in
the capacitor? D) What is the magnitude of the electric field
between the plates? The capacitor is now removed from the 120 V...

The hospital you work for uses a defibrillator that has a single
capacitor with a capacitance of 10-6 F. When it is about
to be used, the defibrillator is charged to a voltage of 4000
V.
a) How much charge is stored on the defibrillator ‘s capacitor when
it has been fully charged?
b) If you were to connect an additional 3 x 10-6 F capacitor in
parallel with the original 10-6 F capacitor in the defibrillator,
what would be...

Circle the FALSE statement.
Select one:
a. When an electric current exists in an inductor, energy is
stored in the magnetic field that surrounds it.
b. A resistor stores energy in the electric and magnetic fields
that surrounds it when an electric current exists in it .
c. A charged capacitor stores energy in the electric field
between the plates.
d. In a circuit containing an inductor and capacitor and
oscillations are taking place, energy is alternately stored in the...

When an air capacitor with a capacitance of 340 nF (1 nF =
10−9F) is connected to a power supply, the energy stored in the
capacitor is 1.65×10−5 J . While the capacitor is kept
connected to the power supply, a slab of dielectric is inserted
that completely fills the space between the plates. This increases
the stored energy by 2.30×10−5 J
What is the potential difference between the capacitor
plates?
What is the dielectric constant of the slab?
Two...

16.3 Capacitance
57. MC
A capacitor is first connected to a 6.0-V battery and then
disconnected and connected to a 12.0-V battery. How does its
capacitance change: (a) It increases, (b) it decreases, or (c) it
stays the same?
58. MC
A capacitor is first connected to a 6.0-V battery and then
disconnected and connected to a 12.0-V battery. How does the charge
on one of its plates change: (a) It increases, (b) it decreases, or
(c) it stays the same?
59. MC...

An ultracapacitor is a very high-capacitance device capable of
storing much more energy than an ordinary capacitor. It is designed
so that the spacing of the plates is around 1000 times smaller than
in ordinary capacitors. Furthermore the plates contain millions of
microscopic nanotubes, which increase their effective area 100,000
times.
1) If the plate separation and effective area of a 10-μμF
capacitor are changed as described above to make an ultracapacitor,
what is its new capacitance? (ONE significant figure)...

A parallel-plate air capacitor is made from two plates 0.200 m m
square, spaced 0.900 cm c m apart. It is connected to a 120 V V
battery
QUESTION: If the battery is disconnected and then the plates are
pulled apart to a separation of 1.40 cmcm , what are the answers to
parts A, B, C, and D?
Part A was the capacitance was 3.93 x 10^-11 F
Part B was the charge on each plate was 4.7 x...

please use Polya method to solve, Prep-include picture, plan,
execute, check.
When a potential difference of 250 V is applied to the plates of
an air-filled parallel-plate capacitor, the plates carry a surface
charge density of 3.00 x 10^-10 C/cm2 . a) What is the spacing
between the plates? b) Suppose that the area of the plates is 15
cm^2 , what is the capacitance of the capacitor? c) What energy is
stored in the capacitor?

Two identical capacitors store different amounts of energy:
capacitor A stores 1.4 x 10-3 J, and capacitor b stores 7.8 x 10-4
J. The voltage across the plates of capacitor B is 12 V. Find the
voltage across the plates of capacitor A.

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