What is a formula for ENF that relates I (current) and H (Henry) ?

[Arshad_Physic]

Homework Statement

I have this question. If I can get that formula, I will be able to solve it! :)

Here is the question:

The current in a 51 mH inductor changes with time as I = b t² − a t. With a = 20 A/s and b = 7 A/s², find the magnitude of the induced emf, |E|, at t = 1.2 s. Answer in units of V.

E = Emf

Homework Equations

This is what I need to know! :)

The Attempt at a Solution

I am guessing that I will have to differentiate the equation. Please help! :)

Thanks

 

[Stonebridge]

The induced emf in a pure inductor is -LdI/dt (L in henry)
You guessed right!

 

[Arshad_Physic]

thanks! :) it works! :)