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)
Math question: Find the value of c for the constant function f(x)=c if f(3)=9.
+
What is the unit vector in the direction of vector A(2, -1, 3)?
+
What is the derivative of f(x) = 5x^3 - 2x^2 + 7x - 4?
+
New questions in Mathematics
Let 𝑢 = 𝑓(𝑥, 𝑦) = (𝑒^𝑥)𝑠𝑒𝑛(3𝑦). Check if 9((𝜕^2) u / 𝜕(𝑥^2)) +((𝜕^2) 𝑢 / 𝜕(𝑦^2)) = 0
Determine the correct value: A company knows that invoices pending collection have a normal distribution with a mean of $1.65 million, with a standard deviation of $0.2 million, then: The probability that an invoice pending collection has an amount that is within more than 2 deviations below the mean, is:
The Lenovo company manufactures laptop computers, it is known that for every 60 laptops produced, 54 go on the market with the highest quality standards. If a sample of 15 laptops is taken, calculate the probability that: Exactly 2 are not of high quality
9b^2-6b-5
"If three wolves catch three rabbits in three hours, how many wolves would it take to catch a hundred rabbits in a hundred hours?" The answer is the number of response units.
A pair of die is thrown and the absolute difference of the two scores is recorded. What is the probability of the absolute difference being 4 or more?
What is the total tolerance for a dimension from 1.996" to 2.026*?
calculate the area in square units of A rectangle with length 6cm and breadth 5cm
A person decides to invest money in fixed income securities to redeem it at the end of 3 years. In this way, you make monthly deposits of R$300.00 in the 1st year, R$400.00 in the 2nd year and R$500.00 in the 3rd year. Calculate the amount, knowing that compound interest is 0.6% per month for the entire period. The answer is 15,828.60
Let A, B, C and D be sets such that | A| = |C| and |B| = |D|. Prove that |A × B| = |C × D|
A researcher is interested in voting preferences on change of the governing constitution in a certain country controlled by two main parties A and B. A questionnaire was developed and sent to a random sample of voters. The cross tabs are as follows Favour Neutral Oppose Membership: Party A 70 90 85 Party B 50 50 155 Test at α = 0.05 whether party membership and voting preference are associated and state the conditions required for chi-square test results to be valid.
Which of the methods below can be used to workout 95% of an amount? a. Dividing the amount 100 and multiply by 95 b. Working out 5% of the amount and taking it away from the full amount c. Dividing 95 by 100 and multiplying the answer by the amount d. Dividing the amount by 95 and then multiply by 100
What is 75 percent less than 60
In poker, a full house consists of five cards, where two of the cards have the same number (or letter) and the remaining three also have the same number (or letter) as each other (but not as the previous two cards). Use a search engine or Wikipedia to understand the concept better if necessary. In how many different ways can one obtain a full house?
Log0
if y=1/w^2 yw=2-x; find dy/dx
If the mean of the following numbers is 17, find the c value. Produce an algebraic solution. Guess and check is unacceptable. 12, 18, 21, c, 13
Marc, Jean and Michelle have traveled a lot. Marc drove twice as much as Jean, but it was Michelle who drove the most with 100km more than Marc. They respected their objective of not exceeding 1350km of distance. How far did John drive?
What is the set-off agreement? Make your own example, describe and put in T accounts how you record transactions.
x(squared) -8x=0