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Firdavs [7]
3 years ago
15

Question 18 of 20

Physics
1 answer:
disa [49]3 years ago
5 0

Answer:D

Explanation:

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The electric field strength is 20,000 N/C inside a parallel-platecapacitor with a 1.0 mm spacing. An electron is released fromre
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Explanation:

It is given that,

Electric field strength, E = 20,000 N/C

Spacing between parallel-plate capacitor, d = 1 mm = 0.001 m

Initial velocity of electron, u = 0

Let v is the electron’s speed when it reaches the positive plate. The force acting on the electron is :

F=qE

Also, ma=qE

a=\dfrac{qE}{m}

a=\dfrac{1.6\times 10^{-19}\times 20,000}{9.1\times 10^{-31}}

a=3.51\times 10^{15}\ m/s^2

Using third equation of motion as :

v^2-u^2=2ad

v=\sqrt{2ad}

v=\sqrt{2\times 3.51\times 10^{15}\times 0.001}

v = 2649528.2599 m/s

or

v=2.64\times 10^6\ m/s

So, the velocity of the electron when it reaches the positive plate is 2.64\times 10^6\ m/s. Hence, this is the required solution.

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3 years ago
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Andreyy89

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Why is energy efficiency important to society’s need to be efficient with energy usage?
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