How to not fk up graph questions. (1 Viewer)

[jamesfirst]

I always fail at emf graph or what ever graph question in the multiple choice there are ........................


How do you master these graphs T.T.

 

[xV1P3R]

Asin emf from flux?

You could consider emf = -n*change in flux / change in time

Usually in multiple choice, you're given a flux curve and asked to determine which one of the options is the emf?

So if you have a sine curve, think about differentiating to a cosine curve and flipping it.

 

[jamesfirst]

Not just that. Just graph in generally

For e.g Transformer graph questions etc etc....



And there was this question where I had to determine where the flux will be maximum in an AC graph


Flux = maximum when EMF = 0 right ???

 

[xV1P3R]

I can't remember whether Jacaranda had it, but here's one from in2physics:

 

[jamesfirst]

It has a similar one in the Jacaranda book