# Solve Cyclotron Motion Homework

• solzonmars
In summary, an electron in a cathode-ray tube is accelerated through a potential difference of 10 kV and then enters a region of uniform magnetic field with a width of 2.4 cm. Using the equations for circular motion and knowing the initial velocity and potential difference, we can calculate the radius of the electron's path as 10.669 cm. Solving for the magnetic field gives a value of 4.1 * 10^-7 T, but this result was found to be incorrect. The angle theta for the tangent at the exit point was found to be 15°.
solzonmars

## Homework Statement

An electron in a cathode-ray tube is accelerated through a potential difference of 10 kV, then passes through the d = 2.4-cm-wide region of uniform magnetic field in the figure.

## Homework Equations

- Am I taking the entirely wrong approach in the solution?

## The Attempt at a Solution

Since this is circular motion, we can draw a circle which intersects the square in the picture at where the electron exits the cathode ray tubes and the place it exits the square. Geometry then gives the angle between the tangent to the latter point and the hypotenuse, and we find that the radius is 10.669 cm. We could then use mv^2/R = qvB, and we know that 1/2mv^2 = q*10000 from the cathode ray tube. Solving for B gives B = 4.1 * 10^-7 T, which is incorrect.

#### Attachments

• 33.P59.jpg
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What is the angle theta?
It's not given in your question, how did you calculate the radius?

I didn't realize it wasn't given in the figure. Theta is 15°.

## 1. What is cyclotron motion?

Cyclotron motion is the circular motion of a charged particle in a uniform magnetic field. The particle moves in a circular path due to the Lorentz force, which is the force experienced by a charged particle in a magnetic field.

## 2. How is cyclotron motion used in science?

Cyclotron motion is used in a variety of scientific applications, such as particle accelerators, mass spectrometry, and medical imaging. It allows scientists to manipulate and study the behavior of charged particles in a controlled manner.

## 3. What is the equation for cyclotron motion?

The equation for cyclotron motion is given by F = qvB, where F is the Lorentz force, q is the charge of the particle, v is its velocity, and B is the magnetic field strength. This equation can also be written as ma = qvB, where m is the mass of the particle and a is its acceleration.

## 4. What factors affect the motion of a particle in a cyclotron?

The motion of a particle in a cyclotron is affected by several factors, including the strength of the magnetic field, the charge and mass of the particle, and the initial velocity of the particle. The radius of the particle's path is also affected by these factors, as well as the frequency and strength of the alternating electric field used to accelerate the particle.

## 5. How do you solve problems involving cyclotron motion?

To solve problems involving cyclotron motion, you will need to use the equations for the Lorentz force and centripetal force to determine the acceleration and radius of the particle's path. You may also need to use other equations depending on the specific problem, such as equations for energy or velocity. It is important to carefully analyze the given information and assign appropriate values to variables before solving the problem.

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