Finding Current in a Long Solenoid

  • Thread starter Thread starter missyc8
  • Start date Start date
  • Tags Tags
    Current Solenoid
AI Thread Summary
To find the current in a long solenoid with 100 turns/cm, an electron moving at 0.048c in a circular path of radius 2.20 cm is analyzed. The formula used is i = mv/e*mu*n*r, where m is the electron mass, v is speed, e is charge, mu is permeability, n is turns per meter, and r is radius. The initial calculation yielded an incorrect current of 0.266 A, prompting a review of the equation and calculations. After correcting for potential errors, including the need for brackets in the denominator, the correct current was determined to be 0.297 A. Accurate calculations are crucial for solving physics problems involving electromagnetic fields.
missyc8
Messages
9
Reaction score
0

Homework Statement


A long solenoid has 100 turns/cm and carries current i. An electron moves within the solenoid in a circle of radius 2.20 cm perpendicular to the solenoid axis. The speed of the electron is 0.048 c (c = speed of light). Find the current i in the solenoid.



Homework Equations



i= mv/e*mu*n*r

The Attempt at a Solution


i= (9.11E-31kg)(.0480)(3.0E8)/ (1.6E-10 C)(4*pi E-7 Tm/A)(100/.01 m) (2.2E-2) = .266 A
this answer is wrong...
what am i doing wrong? thank you!
 
Physics news on Phys.org
Probably a typo but you wrote 1.6E-10 for the charge on the electron.
Of course you need brackets around all the factors in the denominator.
I ran your calc through my calculator and got .297 A.
 
yeah, that's right! i must have messed up on the calculations somewhere!
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Calculating Current in a Wire Loop Inside and Outside a Solenoid
Replies
9
Views
6K
Circular loop of wire is concentric with a solenoid
Replies
10
Views
4K
Induced Current Problem from the professor not in our textbook
Replies
2
Views
1K
Calculating Induced Current in a Coil Surrounding a Changing Current Solenoid
Replies
5
Views
4K
Current in a solenoid (conceptual)
Replies
1
Views
4K
Magnetization of the core of a long solenoid
Replies
5
Views
2K
EMF induced in a coil encircling an ideal solenoid
Replies
2
Views
2K
Finding the current in a solenoid
Replies
3
Views
3K
Induced current in a coil around a solenoid
Replies
1
Views
3K
Electron Motion in a Long Solenoid
Replies
2
Views
3K

Hot Threads

Recent Insights

Back
Top