Speed and Direction of Electron orbiting within a Solenoid

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Homework Help Overview

The discussion revolves around the motion of an electron orbiting within a solenoid, specifically focusing on its speed and direction. The problem involves understanding the magnetic field generated by the solenoid and how it affects the electron's motion.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to find the magnetic field of the solenoid and its relation to the electron's motion. There are questions about whether to use conservation of energy or to derive the magnetic field first. Some participants inquire about the current in the solenoid and its implications for the problem.

Discussion Status

The discussion is ongoing, with participants exploring different aspects of the problem. Guidance has been offered regarding the importance of the magnetic field, but no consensus has been reached on the approach to take or the specific values needed for calculations.

Contextual Notes

There is uncertainty regarding the current in the solenoid, and it is noted that the problem may be part of a multiple-choice question format. Additionally, the absence of figure 28.8 is mentioned as a potential limitation in understanding the problem setup.

rodanme
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In Fig. 28.8, a view of the solenoid, showing the clockwise sense of the current in the windings, is given. An electron is in circular motion near the center of the solenoid, with an orbital diameter of 3.0 cm. The speed of the electron and the sense of the orbital motion are closest to

The diameter of the solenoid is 4 cm
The diameter of the e- orbiting within the solenoid is 3 cm

Homework Equations



r = mv/qb

T= (2*pi*m)/qb

The Attempt at a Solution



Not really sure how to start the problem.
Would I take a conservation of energy approach?
Do I need to try and figure out the B field of the solenoid?
 
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Start with finding the B field of the solenoid.

For the next step, consider that the electron is a charged particle that travels in that B field.
 
The Equation for B_solenoid = Mu_0 * I * n

how can I find the current of the solenoid?
 
They have to give the current, or they want the answer in terms of the current.

Judging by the problem statement, this looks like an MCQ problem. If so, do you have the answer list?

If not, do you have this figure 28.8?
 

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