__ Problem 4-1__ Source:
Problem elaborated by the author of the site.

Knowing that _{1} = 12 H,
L_{2} = 4 H _{3} = 6 H

**Problem solving:**
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__ Problem 4-2__ Source:
Problem elaborated by the author of the site.

In the figure below, _{1} = 12 H, L_{2} = 6 H_{3} = 12 H

Calculate the total inductance of the circuit show in

**Problem solving:**
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__ Problem 4-3__ Source:
Problem elaborated by the author of the site.

In the figure below, _{1} = 12 H, L_{2} = 6 H_{3} = 12 H

Calculate the total inductance of the circuit show in

**Problem solving:**
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__ Problem 4-4__ Source:
Problem elaborated by the author of the site.

Suppose the circuit is in permanent regime. Calculate the energy
stored by the inductors in the circuit show in

**Problem solving:**
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