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Electromagnetic induction- stuck on a few questions

Hi,

I'm stuck on a couple of questions from the textbook.

Q3. Circular coil diameter= 24mm Turns=40 Flux density = 85 mT
i. Area of coil= 4.5×10^-4 m^2
ii. Flux linkage= 1.53×10^-3 Wb
bi. Change of flux linkage when coil reversed in O.095s = 3.1×10^-3 Wb
bii. Magnitude of induced emf- I used
emf=-N× change of flux density/ change in time. I feel like I'm using the wrong values as I can't get to the right answer ( my answers to previous parts are correct).

Q1bii. Sketch a graph of how induced emf in coil changes with time- I don't understand why it's a straight horizontal line.

Q4. I've read a couple of threads about the question attached but I'm still not sure how to tackle the constant.

Any help on any of the questions would be really appreciated :smile:

Reply 1

VioletPhillippo

1479679835648450922585.jpg522.9KB

Reply 2

hezzlington

can you show attempt at the question, or at least the thought process? What are the relevant equation, what parameters are you given. Write it all down etc.

We're not really allowed to just write out the answer for you