Question

An electron is ejected with speed v=107 m/s into the uniform field created by the flat and parallel sheets of the figure. The field is directed vertically downwards and is null except in the space between the sheets. The electron It enters through a point located at an equal distance between the two sheets. Yes when you leave field, the electron passes just through the edge of the sheet: a) Find the intensity of the field b) Find the direction of the speed of the electron when it leaves the field.

158

likes
788 views

Answer to a math question An electron is ejected with speed v=107 m/s into the uniform field created by the flat and parallel sheets of the figure. The field is directed vertically downwards and is null except in the space between the sheets. The electron It enters through a point located at an equal distance between the two sheets. Yes when you leave field, the electron passes just through the edge of the sheet: a) Find the intensity of the field b) Find the direction of the speed of the electron when it leaves the field.

Expert avatar
Neal
4.5
105 Answers
Para resolver este problema, utilizaremos la ley de la fuerza eléctrica para determinar la intensidad del campo y la dirección de la velocidad del electrón cuando sale del campo.

a) Para hallar la intensidad del campo, utilizamos la siguiente fórmula:

F = q \cdot E

donde F es la fuerza eléctrica, q es la carga del electrón y E es la intensidad del campo.

Sabemos que la fuerza eléctrica es la fuerza centrípeta que actúa sobre el electrón, por lo que podemos escribir:

F = \frac{{m \cdot v^2}}{{r}}

donde m es la masa del electrón, v es su velocidad y r es el radio de la trayectoria del electrón.

El radio de la trayectoria del electrón es la distancia entre las dos láminas, que llamaremos d. Dado que el electrón entra por un punto situado a igual distancia entre las láminas, podemos decir que r = d/2.

Reemplazando estos valores en la ecuación de la fuerza eléctrica, obtenemos:

\frac{{m \cdot v^2}}{{r}} = q \cdot E

\frac{{m \cdot v^2}}{{d/2}} = q \cdot E

Resolviendo para E, obtenemos:

E = \frac{{2 \cdot m \cdot v^2}}{{q \cdot d}}

Por lo tanto, la intensidad del campo es:

E = \frac{{2 \cdot m \cdot v^2}}{{q \cdot d}}

b) Para hallar la dirección de la velocidad del electrón cuando sale del campo, podemos utilizar la ley de conservación de la energía cinética:

\frac{{1}}{{2}} \cdot m \cdot v^2 = q \cdot V

donde V es el potencial eléctrico en el borde de la lámina.

La energía cinética inicial del electrón es igual a su energía cinética final más la energía potencial eléctrica ganada:

\frac{{1}}{{2}} \cdot m \cdot v^2 = q \cdot V

Dado que el electrón pasa justamente por el borde de la lámina cuando sale del campo, el potencial eléctrico en ese punto es cero (V = 0). Por lo tanto, la velocidad del electrón cuando sale del campo es la misma que su velocidad inicial, v = 107 m/s.

Por lo tanto, la dirección de la velocidad del electrón cuando sale del campo es la misma que su dirección inicial, que es vertical hacia abajo.

Answer:
a) La intensidad del campo es E = \frac{{2 \cdot m \cdot v^2}}{{q \cdot d}}
b) La dirección de la velocidad del electrón cuando sale del campo es vertical hacia abajo.

Frequently asked questions (FAQs)
Question: What is the sine value of an angle 𝜃 in the unit circle chart?
+
What is the value of f(2) for f(x) = 10^x and f(x) = e^x?
+
Find the resultant displacement by adding vector AB = 5i + 3j - 2k to vector CD = -2i + 4j + 7k.
+
New questions in Mathematics
5 squirrels were found to have an average weight of 9.3 ounces with a sample standard deviation is 1.1. Find the 95% confidence interval of the true mean weight
Since one of the three integers whose product is (-60) is (+4), write the values that two integers can take.
(x^2+3x)/(x^2-9)=
Jose bought 3/4 of oil and his sister bought 6/8, which of the two bought more oil?
What payment 7 months from now would be equivalent in value to a $3,300 payment due 23 months from now? The value of money is 2.7% simple interest. Round your answer to 2 decimal places. Show all work and how you arrive at the answer..
X^2 = 25
A bird randomly chooses to land on 1 of 12 perches available in its aviary. Determine the Probability of it landing on a perch numbered 8 and then on a perch marked with a prime number; take into account that he never lands on the same perch in the sequence.
2x-4y=-6; -4y+4y=-8
Sean must chose a 6- digit PIN number for his online banking account.Each digit can be chosen from 0 to 9. How many different possible PIN numbers can sean chose.
is the x element (180,270), if tanx-3cotx=2, sinx ?
Substitute a=2 and b=-3 and c=-4 to evaluate 2ac/(-2b^2-a)
. What will be the osmotic pressure of a solution that was prepared at 91°F by dissolving 534 grams of aluminum hydroxide in enough water to generate 2.784 ml of solution.
How to do 15 x 3304
Three machines called A, B and C, produce 43%, 26% and 31% of the total production of a company, respectively. Furthermore, it has been detected that 8%, 2% and 1.6% of the product manufactured by these machines is defective. a) What is the probability that a product is not defective? b) A product is selected at random and found to be defective, what is the probability that it was manufactured on machine B?
nI Exercises 65-68, the latitudes of a pair of cities are given. Assume that one city si directly south of the other and that the earth is a perfect sphere of radius 4000 miles. Use the arc length formula in terms of degrees to find the distance between the two cities. 65. The North Pole: latitude 90° north Springfield, Illinois: latitude 40° north
To find the increased amount on a standard term deposit with the following conditions: starting amount: BGN 13000, type of deposit: annual, annual compound interest rate: 1.4%, after 4 years;
Read the “Local Communities as Stakeholders: Does Amazon Really Need Tax Breaks?” example on p. 83 in Ch. 3 of Management: A Practical Introduction. In your response, discuss whether you feel that tax breaks for big companies benefit local communities. Describe ways to attract business to a region without having a negative impact on the larger community.
Define excel and why we use it?
Solve the system of equations by the addition method. 0.01x-0.08y=-0.1 0.2x+0.6y=0.2
The car with an irresponsible driver starts to brake when it goes through a red light. When passing the traffic light, he does so at a speed of 115 kph in the right lane. Further ahead, 70 meters from the traffic light, a child is crossing the street and falls. If the effect of the car's brakes is equivalent to a deceleration of magnitude 5.7m/s². Is the child hit by the car or not? How far from the traffic light does the car stop?