What am i suppose to do with this problem?

Question

the problem is: The current in am inductor is changing at the rate of 100A/s, and the inductor emf is 40V. What is its self-inductance?

Here is how i did it: i used faraday's law, which states: E=-L di/dt

since we know E=40v and di/dt=100A/s here, i just plugged in, and got L=.4H, but the strange thing is the answer for this problem should be 14.6mT.

First, shouldnt the unit for L being H? i thought mT is the unit for magnetic field.

Second, how to get the answer 14.6?

Anyone got an idea for this?

Thanks

Answer 1

Yes, the unit for L is H (Henry) and the unit for magnetic field is T (Tesla)

I think you solution is right and the answer of 14.6mT is wrong.

Please, when you have the correct answer let as know.