Question

Two 2.3-cm-diameter-disks spaced 2.0 mm apart form a parallel-plate capacitor. The electric field between the disks is 4.6×105 V/m .

**Part A**

What is the voltage across the capacitor?

**Part B**

How much charge is on each disk?

**Part C**

An electron is launched from the negative plate. It strikes the
positive plate at a speed of 2.3×10^{7} m/s . What was the
electron's speed as it left the negative plate?

Answer #1

here,

diameter of each disk , d = 2.3 cm = 0.023 m

radius , r = d/2 = 0.0115 m

spacing between them , s = 2 mm = 0.002 m

electric feild , E = 4.6 * 10^5 V/m

a)

the voltage across the capacitor , V = E * s

V = 4.6 * 10^5 * 0.002 = 920 V

b)

the charge on disk , Q = C * V

Q = (area * e0 /s) * V

Q = (pi * 0.0115^2 * 8.85 * 10^-12 /0.002) * 920

Q = 1.69 * 10^-9 C

c)

u = 2.3 * 10^7 m/s

let the final speed be v

using work energy theorm

V * e = 0.5 * m * ( v^2 - u^2)

920 * 1.6 * 10^-19 = 0.5 * 9.1 * 10^-31 * ( v^2 - ( 2.3 * 10^7)^2)

solving for v

v= 2.92 * 10^7 m/s

the final speed is 2.92 * 10^7 m/s

Two 2.2-cm-diameter-disks spaced 1.9 mm apart form a
parallel-plate capacitor. The electric field between the disks is
4.8×105 V/m .
a) How much charge is on each disk?
b) An electron is launched from the negative plate. It strikes
the positive plate at a speed of 2.0×107 m/s . What was the
electron's speed as it left the negative plate?

Two 2.5-cmcm-diameter-disks spaced 1.5 mmmm apart form a
parallel-plate capacitor. The electric field between the disks is
4.7×105 V/mV/m .
What is the voltage across the capacitor?
How much charge is on each disk?
An electron is launched from the negative plate. It strikes the
positive plate at a speed of 2.0×107 m/sm/s . What was
the electron's speed as it left the negative plate?

Two 2.3-cm-diameter-disks spaced 1.6 mm apart form a
parallel-plate capacitor. The electric field between the disks is
5.0×105 V/m . Part A Part complete What is the voltage across the
capacitor? Express your answer with the appropriate units. V = 800
V Previous Answers Correct Part B How much charge is on each disk?
Enter your answers numerically separated by a comma. Express your
answers in coulombs. q1, q2 = 1.836⋅10−9,1.836⋅10−9 C Previous
AnswersRequest Answer Incorrect; Try Again; 5 attempts...

Two 2.0-cm-diameter-disks spaced 2.0 mm apart form a
parallel-plate capacitor. The plates have charge
± 8.8nC.
What is the voltage across the capacitor? deltaVc
=_______________ Dont forget unit
An electron is launched from the negative plate. It strikes the
positive plate at a speed of 5.5×107 m/s . What was the
electron's speed as it left the negative plate?
vinitial=_____________________Dont forget unit

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What are the diameters of the disks?
Express your answer with the appropriate
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1. What potential difference is needed to accelerate a He+ ion
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2. Two 2.00 cm × 2.00 cm plates that form a parallel-plate
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a) What is the electric field strength inside the capacitor if
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b)What is potential difference across the capacitor if the
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1. What is the charge (in nC) on the positive electrode?
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The electric field strength is 1.80×104 N/C inside a
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