Questions on Magnetic Induction

AI Thread Summary
Insulated copper wire is essential for electromagnet coils to prevent short circuits and ensure efficient current flow. An iron core significantly enhances the strength of an electromagnet compared to a wooden core due to its magnetic properties. The strength of an electromagnet increases with higher current magnitude and more turns of wire around the core. The equation B = UoNI / 2a describes the magnetic field strength, where B is the magnetic flux density, Uo is the permeability of free space, N is the number of turns, and I is the current. The discussion highlights challenges in deriving the equation, indicating a need for clearer understanding of the underlying principles.
metz143
Messages
13
Reaction score
0
1.Why must you use insulated copper wire for the coils of an electromagnet?
2. How does the strength of a wooden core electromagnet compare with that of the iron electromagnet?
3. How does the magnitude of the current affect the strength of the electromagnet?
4. How does the number of turns affect the strength?
5. How was this equation derive?
B= UoNI /2a


Thanks in advance. :confused: :smile:
 
Physics news on Phys.org
did you try to answer it? what is your answer?
 
Yes, i tried to answer question 5..but got it wrong..i keep solving it but still i didn't get it right.
 

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

Magnets near a current carrying wire
Replies
12
Views
2K
Understanding self-inductance in a solenoid.
Replies
3
Views
1K
Verify Magnetic Induction Homework: 50A Copper Wire 0.5*10-2m
Replies
5
Views
2K
Calculating Magnetic Field Strength and Force of Eddy Currents in a Solenoid
Replies
49
Views
5K
B What is the difference between B and H?
Replies
14
Views
2K
I How induction works within a coil (nuances of it)
Replies
6
Views
2K
How Do Electromagnets Repel Each Other in a Zero-Resistance Environment?
Replies
6
Views
1K
The size and direction of magnetic induction and force
Replies
4
Views
2K
Understanding Electromagnetic Induction: Flux and Induced e.m.f.
Replies
1
Views
2K
Simple Question about the direction of magnetic induction
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top