How can I find the number of turns in a solenoid winding?

AI Thread Summary
To determine the number of turns in a solenoid winding, the mutual inductance formula can be applied, but it requires known values for the solenoid's inductance and dimensions. The inductance of the solenoid is given as 30mH, with a length of 0.4m and a diameter of 0.1m. The resistance of the coil is 5.0 ohms, and the mutual inductance is 60μH. The current in the solenoid is 0.3A, decreasing at a rate of 2.5A/s, which is relevant for calculating induced emf and flux linkage. The discussion emphasizes the need to clarify which values are unknown to solve for the number of turns effectively.
kdawg4
Messages
3
Reaction score
0
A 30mH solenoid inductor is wound on a form 0.4 m in length and 0.1 m in diameter. A coil is tightly wound around the solenoid at its center. the coil resistance is 5.0 ohms. The mutual inductance of the coil and solenoid is 60μH. At a given instant, the current in the solenoid is 0.3A and is decreasing at a rate of 2.5A/s.


a) Find the number of turns in the winding of the solenoid
b) Find the induced emf at the given instant.
c) At the given instant, the flux linkage N(phi) for the solenoid is...


Hey guys, really need a nice simple answer here, thank you...I'm new to the forum by the way :D
At first I used the formula mu(n1)(n2)A/L equals the mutual inductance but now I am stumped since you have 2 unknowns and I don't know how to find one of them
 
Last edited:
Physics news on Phys.org


kdawg4 said:
A 30mH solenoid inductor is wound on a form 0.4 m in length and 0.1 m in diameter. A coil is tightly wound around the solenoid at its center. the coil resistance is 5.0 ohms. The mutual inductance of the coil and solenoid is 60μH. At a given instant, the current in the solenoid is 0.3A and is decreasing at a rate of 2.5A/s.

a) Find the number of turns in the winding of the solenoid
b) Find the induced emf at the given instant.
c) At the given instant, the flux linkage N(phi) for the solenoid is...


Hey guys, really need a nice simple answer here, thank you...I'm new to the forum by the way :D
At first I used the formula mu(n1)(n2)A/L equals the mutual inductance but now I am stumped since you have 2 unknowns and I don't know how to find one of them

Hi kdawg4, Welcome to Physics Forums.

Which part of the problem are you working on? Do you know the formula for the inductance of a solenoid?
 


I am currently workingon all three, and yes I know the formula for the inductance of a solenoid
 


kdawg4 said:
I am currently workingon all three, and yes I know the formula for the inductance of a solenoid

Okay then, for part (a), what values in the formula for the inductance of the solenoid are unknowns (values that you haven't been given)?
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanged mass'

Thread 'A cylinder connected to a hanged mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

EMF induced in a coil encircling an ideal solenoid
Replies
2
Views
2K
Induced Current Problem from the professor not in our textbook
Replies
2
Views
1K
Calculating Induced EMF in a Solenoid Inductor
Replies
1
Views
3K
How Can I Simulate Induced EMF in a Coil Using Ansys Maxwell?
Replies
1
Views
2K
How to Calculate Induced EMF in a Wire Loop Near a Solenoid
Replies
10
Views
3K
Flux density expressions at solenoid centre
Replies
19
Views
2K
EMF induced in solenoid by current in a loop.
Replies
2
Views
5K
How Does Induced EMF Vary Inside a Solenoid?
Replies
6
Views
10K
Inductance of Solenoid on Coaxial Cable
Replies
9
Views
6K
Calculating Average EMF in Two Coils on a Ferromagnetic Core
Replies
7
Views
3K

Hot Threads

Recent Insights

Back
Top