Calculating Current & Voltage in Coil with Magnet

AI Thread Summary
To calculate the induced current and voltage in a coil when a magnet passes through, the magnitude of the magnetic flux is essential. The magnetic flux depends on the strength of the magnet and its interaction with the coil. A rough estimate can be made using Faraday's law of electromagnetic induction, which states that the induced voltage is proportional to the rate of change of magnetic flux. The resistance of the coil, given as 16 ohms, will also affect the induced current calculated using Ohm's law. Understanding these principles allows for basic estimations of current and voltage in this scenario.
Swifters
Messages
12
Reaction score
0
I have been wondering how to calculate how much current and voltage would be induced through a 2m length of coil when a magnet passes through. The coil being 30mm in diameter with 1mm thick wire coiled around 200 times (for ease of calculation so cable would roughly be 18.8m long) with a resistance of say 16 ohms. Magnet being a cylindrical sphere of just under 30mm diameter... This is not homework, just wondered if there was a forumla? many thanks.
 
Physics news on Phys.org


Dosent have to be precise. Any rough estimate will do. Thank you.
 


"Magnet" is an unknown variable in this hypothetical. Magnitude of magnetic flux field is critical for calculating induced current.
 


Magnetic flux? Is that the strength of the magnet? What if it were presumed to be average? Is there a formula?
 


any ideas most welcome...
 

Thread 'Maxwell stress tensor'

This is from Griffiths' Electrodynamics, 3rd edition, page 352. I am trying to calculate the divergence of the Maxwell stress tensor. The tensor is given as ##T_{ij} =\epsilon_0 (E_iE_j-\frac 1 2 \delta_{ij} E^2)+\frac 1 {\mu_0}(B_iB_j-\frac 1 2 \delta_{ij} B^2)##. To make things easier, I just want to focus on the part with the electrical field, i.e. I want to find the divergence of ##E_{ij}=E_iE_j-\frac 1 2 \delta_{ij}E^2##. In matrix form, this tensor should look like this...
View full post »
Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'

Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'

Please can anyone either:- (1) point me to a derivation of the perpendicular force (Fy) between two very long parallel wires carrying steady currents utilising the formula of Gauss for the force F along the line r between 2 charges? Or alternatively (2) point out where I have gone wrong in my method? I am having problems with calculating the direction and magnitude of the force as expected from modern (Biot-Savart-Maxwell-Lorentz) formula. Here is my method and results so far:- This...
View full post »

Similar threads

I How induction works within a coil (nuances of it)
Replies
6
Views
2K
Formula for calculating current and or voltage in a coil
Replies
9
Views
11K
B Rogowski coil tension calculation formula
Replies
17
Views
2K
Induced current in a coil from a constant uniform magnetic field?
Replies
5
Views
2K
B Experiment issues (electromagnetism)
Replies
42
Views
2K
Inductance of Parallel Coils on an uncut toroid magnetic core
Replies
13
Views
3K
Why does the speed of the magnet matter in a coil?
Replies
6
Views
4K
Altered inductance around a solenoid in a cryostat (from Eddy currents?)
Replies
1
Views
1K
Effect of number of coils on current in a generator?
Replies
5
Views
4K
Why do transformers use AC currents in the primary coil?
Replies
6
Views
2K

Hot Threads

Recent Insights

Back
Top