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)
Find the roots of the quadratic equation: x^2 - 5x + 6 = 0.
+
What is 55% as a fraction?
+
What is the length of the unknown side in a triangle, given angle A=45°, side b=8, side c=10?
+
New questions in Mathematics
431414-1*(11111-1)-4*(5*3)
The random variable Y is defined as the sum between two different integers selected at random between -4 and 2 (both included). What are the possible values of the random variable Y? What is the value of P(Y=-3)? And whether it is less than or equal to -5?
1. Suppose we have a good whose quantity supplied changed from 100 to 120 units when the price increased from $10 to $12 per unit. Compute the price elasticity of supply using the midpoint method
An electrical company manufactures batteries that have a duration that is distributed approximately normally, with a mean of 700 hours and a standard deviation of 40 hours. Find the probability that a randomly selected battery has an average life of less than 810 hours.
224 × (6÷8)
In a normally distributed data set a mean of 31 where 95% of the data fall between 27.4 and 34.6, what would be the standard deviation of that data set?
Find the sum of the first 41 terms of the progression that begins: 32, 24, 16, …
The sum of two numbers is equal to 58 and the largest exceeds by at least 12. Find the two numbers
How many anagrams of the word STROMEC there that do not contain STROM, MOST, MOC or CEST as a subword? By subword is meant anything that is created by omitting some letters - for example, the word EMROSCT contains both MOC and MOST as subwords.
The equation of the straight line that passes through the coordinate point (2,5) and is parallel to the straight line with equation x 2y 9 = 0 is
12(3+7)-5
v Is the following statement a biconditional? If Shannon is watching a Tigers game, then it is on television.
7. Find the equation of the line passing through the points (−4,−2) 𝑎𝑛𝑑 (3,6), give the equation in the form 𝑎𝑥+𝑏𝑦+𝑐=0, where 𝑎,𝑏,𝑐 are whole numbers and 𝑎>0.
In an audience of 4000 people, 2 people are chosen, at random, to appear on stage. How many ways can the people be chosen?
(2m+3)(4m+3)=0
(a) List the set of possible rational zeros of the polynomial function F(x) = 2x3 - 11x2 + 13x - 4. (b) Find all rational zeros of F(x). Only do part B
2X+2=8
A psychologist is investigating the levels of test anxiety in various university courses. Anxiety is measured on a scale ranging from 0 to 100, where 0 indicates the complete absence of anxiety and 100 represents an extreme level of anxiety. From the data obtained, it has been discovered that the psychology score is triple that of nursing, and in turn, the latter has a score 10 points lower than the nutrition major. Furthermore, the score in the veterinary degree is 15 points higher than that of nutrition. Finally, if we add the scores of all the races, we will obtain a total of 173 points. Pose the equation that represents the situation described in the previous problem and determine: What is the score that psychology obtained regarding its anxiety level before the exams?
Let I be an interval and let f : I → R be a continuous function such that f(I) ⊂ Q. Show (in symbols) that f is constant.
Carmen's age was twice as old as Luis was when Carmen was Luis's age. When Luis is Carmen's age, their ages will add up to 112.