Why is the value of EMF generated by a generator not zero at t = 0 s?

  • Thread starter songoku
  • Start date
  • #1
songoku
2,115
278
Homework Statement:
This is not homework.

Let say coil of generator is in horizontal position (i.e. the direction of magnetic field of the magnet is perpendicular to the normal vector of the plane of the coil). The coil is then rotated so emf will be induced on the coil.

If I draw the graph of Φ (magnetic flux) against time, the shape will be like sin wave and if I draw the graph of emf against time, the graph will be like negative cosine wave so it means that the starting point of graph of emf against time will a certain negative value (let say -5 V).
Relevant Equations:
ε = - N . dΦ / dt
Does this mean that initially there will be emf induced on the coil at t = 0 s?

Initially, at t = 0 s, the coil has not been rotated yet so based on Faraday's Law, there won't be any change in magnetic flux so why the value of emf is not zero at t = 0 s?

Thanks
 

Answers and Replies

  • #2
haruspex
Science Advisor
Homework Helper
Insights Author
Gold Member
2022 Award
39,216
8,528
at t = 0 s, the coil has not been rotated yet
No, but it is rotating. The emf is created by movement, not position.
 
  • Like
Likes Delta2 and songoku
  • #3
songoku
2,115
278
No, but it is rotating. The emf is created by movement, not position.
Thank you very much haruspex
 

Suggested for: Why is the value of EMF generated by a generator not zero at t = 0 s?

  • Last Post
Replies
7
Views
404
Replies
15
Views
590
Replies
9
Views
164
Replies
3
Views
259
Replies
6
Views
283
Replies
2
Views
365
Replies
19
Views
181
Replies
17
Views
254
Top