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mutual induction problem..

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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
is it ok??

because they presented a much more complicated current.
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