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I recently started learning about magnetic fields and magnetic induction.

I tried to solve the following two problems, but I got stuck. Could you please help?

1)

Current of 15 A is running through the wire loop and magnetic flux throught the wire loop is 3 Wb. What is inductivity L of a wire-loop? Here we obviously can't use formula for inductivity of a coil, so ... I don't know how to go at it.

I = 15 A

FL[ux] ... 3 Wb

2)

Current of 20 A creates inside a coil a magnetic flux of 10 Wb. What is the induced voltage U

*of a coil, if current decreases by 1.2 A each second? I tried to solve it but clearly there are some variables missing - like length of a coil or area of a wire-loop.*

I = 20 A

FL[ux] = 10 Wb

dI = 1.2 A

dt = 1 s

U

I = 20 A

FL[ux] = 10 Wb

dI = 1.2 A

dt = 1 s

U

*= ?*

Like I said, length of a wire is missing for this to be solvable.

cheers

Like I said, length of a wire is missing for this to be solvable.

cheers

**1. Homework Statement****2. Homework Equations****3. The Attempt at a Solution**