# Mutual induction question

1. Aug 29, 2009

### nabliat

http://i28.tinypic.com/ot42gi.jpg

in normal induction finding question
we need to have how a current changes over some period
of time

and emf.

but here i dont have that
i only have emf =-3.2
in t=0.8 i can find a certain current
and in t=0 i can find a certain current.(using the given formula )
i can put them in the formula and get M
$$\epsilon=-M\frac{I(0.8)-I(0)}{0.8-0}$$
is it ok??

because they presented a much more complicated current.

2. Aug 30, 2009