Electromagnetic induction graph of E versus I

Click For Summary
The discussion centers on understanding the relationship between electromotive force (E) and current (I) in the context of electromagnetic induction. It clarifies that the equation E = -L dI/dt is not applicable as stated, since I refers to the current in a larger coil rather than a smaller one. Participants emphasize that the current can be varied, suggesting that dI/dt can be considered zero for the analysis. The conversation hints at the need to identify what parameters are being adjusted in the experiment. Ultimately, the focus is on clarifying the correct application of the principles of electromagnetic induction to solve the problem.
delsoo
Messages
97
Reaction score
0

Homework Statement



for this question, i only know that E=-L dI/dt... the ans is C , can anyone explain how to get C?

Homework Equations





The Attempt at a Solution

 

Attachments

  • DSC_0135~5.jpg
    DSC_0135~5.jpg
    73.3 KB · Views: 484
  • DSC_0136~2.jpg
    DSC_0136~2.jpg
    26.8 KB · Views: 496
Physics news on Phys.org
Your "I only know" expression does not apply. I is in the big coil, not in the little rectangular one.

"Carrying a variable I" here means they are able to set the current to a number of values. (*) You may assume dI/dt = 0.

(*) So what do they vary in this way ? Aha!
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
View full post »

Similar threads

Understanding self-inductance in a solenoid.
  • · Replies 3 ·
Replies
3
Views
2K
Help using electromagnetic induction
  • · Replies 4 ·
Replies
4
Views
1K
Induction: Electromagnet and Aluminium Ring
  • · Replies 1 ·
Replies
1
Views
2K
What happens to a coil of wire as current is increased?
  • · Replies 4 ·
Replies
4
Views
2K
Flux through a coil due to Self-Inductance
  • · Replies 6 ·
Replies
6
Views
4K
Comparing self inductance of three solenoids
  • · Replies 34 ·
2
Replies
34
Views
3K
What does self induction per unit length signify?
  • · Replies 7 ·
Replies
7
Views
3K
How to calculate the mutual inductance?
  • · Replies 3 ·
Replies
3
Views
2K
Understanding a very simply RL circuit
  • · Replies 1 ·
Replies
1
Views
900
Sign of the Faraday-Lenz equation
  • · Replies 1 ·
Replies
1
Views
1K