Question

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 the equivalent capacitance?

c) Increasing the separation between the capacitor plates while hooked up to the voltage source will decrease the charge stored for what reasons?

d) How much energy is stored in the defibrillator ‘s capacitor (10-6 F) when it has been fully charged across 4000V?

Answer #1

A portable defibrillator containing an 85 ?F capacitor is
charged up to a potential difference of 8000 V.
a) How much energy is stored in the device? What kind of energy
is this stored energy?
b. How much positive charge is on one plate of the capacitor
when it is fully charged? What is the net charge on both plates?
Explain why this is the case.

A parallel-plate capacitor has capacitance 7.00 μF.
(a) How much energy is stored in the capacitor if it is
connected to a 4.00-V battery? μJ
(b) If the battery is disconnected and the distance between the
charged plates doubled, what is the energy stored? μJ
(c) The battery is subsequently reattached to the capacitor, but
the plate separation remains as in part (b). How much energy is
stored? μJ

A parallel-plate capacitor has capacitance 7.00 μF.
(a) How much energy is stored in the capacitor if it is
connected to a 11.00-V battery (μJ)?
(b) If the battery is disconnected and the distance between the
charged plates doubled, what is the energy stored (μJ)?
(c) The battery is subsequently reattached to the capacitor, but
the plate separation remains as in part (b). How much energy is
stored (μJ)?

An air-filled capacitor (with a capacitance C) consisting two
parallel plates separated by a distance d is connected to a battery
of voltage V has stored a charge Q. While it is still connected to
the battery, the plate separation is adjusted to 2d. In terms of C,
V and Q, find the new value of capacitance, voltage, charge and
energy stored on the capacitor. Explain your answer. [5 marks]

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...

1 A parallel plate capacitor is connected to a battery
and becomes fully charged the capacitor is then disconnected and
the separation between the plates is halved in such a way that so
charge leaks off As the plate separation is being halved which of
the following parameters remains constant?
An air filled k=1 ideal parallel plate capacitor has a
capacitance of C. If the area of the plates is doubled insert a
dielectric material k=2 and the distance between...

A 13 pF capacitor is connected in series with a 5 pF and 9 pF
capacitor that are connected in parallel. The three capacitors are
connected to a 26 V battery.
A) What is the equivalent capacitance of the circuit?
B) How much charge is on the 13 pF capacitor?
C) What is the potential difference across the 5 pF
capacitor?
D) A parallel plate capacitor of plate area A and plate
separation d is fully charged using a battery...

A parallel plate capacitor of capacitance Co has plates
of area A with separation d between them. When it is connected to a
battery of voltage Vo, it has charge of magnitude
Qo on its plates. It is then disconnected from the battery
and the plates are pulled apart to a separation 2d without
discharging them. After the plates are 2d apart, by what
factor does the magnitude of the charge on the plates change? By
what factor does the...

A parallel plate capacitor in air is constructed with a plate
area of 7.75cm2 and a plate separation of 0.664mm.
A) Determine the value of the capacitance of this parallel plate
capacitor.
B) This capacitor is placed across a 21.0 V battery and allowed
to fully charge. What is the value of this charge with included
units.
C) When fully charged, what is the energy stored inside the
capacitor?
D) With the battery still connected, a pyrex glass dielectric
material...

A 13 pF capacitor is connected in series with a 5 pF and 9 pF
capacitor that are connected in parallel. The three capacitors are
connected to a 26 V battery. (Show all your work!) A) What is the
equivalent capacitance of the circuit? B) How much charge is on the
13 pF capacitor? C) What is the potential difference across the 5
pF capacitor?
D) A parallel plate capacitor of plate area A and plate
separation d is fully...

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